ASUS Zenfone 12 Ultra vs Samsung Galaxy S25 Edge | TechTalkTown
ASUS Zenfone 12 Ultra vs Samsung Galaxy S25 Edge
ASUS Zenfone 12 Ultra
ASUS
7.4
Capable big-screen flagship, short support
Samsung Galaxy S25 Edge
Samsung
6.8
Gorgeous compromise
ASUS Zenfone 12 Ultra
What Reviewers Agree On
Snapdragon 8 Elite delivers excellent, lag-free performance and rock-solid gaming with no overheating in the slim body.
The 6-axis gimbal main camera is a genuine standout, with ~66% better stabilization than the 11 Ultra.
Strong battery life (~10–11 hours of screen time) with fast 65W wired charging plus 15W wireless.
It undercuts the Galaxy S25 Ultra and other flagships on price while keeping flagship hardware.
A clean, near-stock Android experience with rare extras like a headphone jack and IP68.
Deal Breakers
Pros & Cons
ASUS Zenfone 12 Ultra
Pros
Snapdragon 8 Elite delivers excellent, lag-free performance and rock-solid gaming with no overheating in the slim body.
The 6-axis gimbal main camera is a genuine standout, with ~66% better stabilization than the 11 Ultra.
Strong battery life (~10–11 hours of screen time) with fast 65W wired charging plus 15W wireless.
It undercuts the Galaxy S25 Ultra and other flagships on price while keeping flagship hardware.
A clean, near-stock Android experience with rare extras like a headphone jack and IP68.
Detailed Comparison
Design & Build
ASUS Zenfone 12 Ultra
Essentially a ROG Phone 9 without the gamer flourishes — a clean, premium, eco-conscious big-screen handset with rare enthusiast extras.
It's essentially a ROG Phone 9 stripped of its gamer credentials — flat screen, rounded corners, flat frame, and it loses the funky AniMe Vision rear display.
A minimal-looking handset that majors on eco-friendly materials — a 100% recycled aluminium frame and 22% recycled glass over the 6.78-inch screen.
Asus reveals the Zenfone 12 Ultra with a spotless design and a powerful flagship chip.
It keeps rare enthusiast hardware including a side-mounted fingerprint reader, IP68 and a 3.5mm headphone jack.
It carries an internal cooling system with a fan comparable to Red Magic gaming phones, helping it run cool in a slim 8.9mm body.
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Only ~2 OS updates promised — far short of the 7 years from Google and Samsung.
Camera quality is subpar versus rival flagships, falling away past 3x optical zoom with no ultrawide autofocus.
An 'Ultra' with no QHD screen, no ultrasonic fingerprint and no barometer — plus Asus stepping back from phones raises support concern.
Samsung Galaxy S25 Edge
What Reviewers Agree On
At 5.8mm and 163 grams the Edge genuinely feels transformatively lighter and thinner in hand than any other current flagship — picking it up is repeatedly described as a surprise even by reviewers skeptical of thin phones.
Build quality is premium and durable for the form factor — titanium frame, Gorilla Glass Ceramic 2 on the front (first phone to use it), Gorilla Glass Victus 2 on the back, IP68 rating intact.
The 6.7-inch 1440p LTPO AMOLED is one of the best smartphone displays in 2025 — 2,600-nit peak brightness, 120Hz, sharp and bright in any lighting.
Short-burst performance from the Snapdragon 8 Elite for Galaxy + 12GB RAM matches or beats the S25 Ultra in single-shot benchmarks, with no noticeable lag in everyday use.
The 200MP main sensor (inherited from the S25 Ultra) takes genuinely strong photos with crisp detail, and the new wider 12MP selfie camera is a small upgrade for group shots.
Samsung commits seven years of OS and security updates, matching the industry's best long-term support window.
Deal Breakers
The 3,900 mAh battery is the smallest in the entire Galaxy S25 lineup — smaller even than the base S25's cell — and real-world endurance trails the S25+, S25 Ultra and most rivals by a meaningful margin.
There is no telephoto camera at all — only the 200MP main and a 12MP ultrawide — making it the only S25 phone without optical zoom and a hard sell for anyone who shoots distant subjects.
Under sustained 3DMark stress tests Notebookcheck measured GPU performance dropping to roughly half its initial score (46.3% Wild Life stability), confirming the slim chassis can't dissipate enough heat for long gaming sessions.
Wired charging is capped at 25W and wireless at 15W — well behind the OnePlus 13 and Xiaomi rivals, with a full charge taking about 1 hour 20 minutes from the wall.
Samsung skipped the new silicon-carbon battery chemistry already shipping in the OnePlus 13, Xiaomi 15, Vivo X200 and other competitors — the single technology that could have made the thin form factor work, repeatedly flagged by MKBHD, Dave2D and Mrwhosetheboss.
Cons
Only ~2 OS updates promised — far short of the 7 years from Google and Samsung.
Camera quality is subpar versus rival flagships, falling away past 3x optical zoom with no ultrawide autofocus.
An 'Ultra' with no QHD screen, no ultrasonic fingerprint and no barometer — plus Asus stepping back from phones raises support concern.
Samsung Galaxy S25 Edge
Pros
At 5.8mm and 163 grams the Edge genuinely feels transformatively lighter and thinner in hand than any other current flagship — picking it up is repeatedly described as a surprise even by reviewers skeptical of thin phones.
Build quality is premium and durable for the form factor — titanium frame, Gorilla Glass Ceramic 2 on the front (first phone to use it), Gorilla Glass Victus 2 on the back, IP68 rating intact.
The 6.7-inch 1440p LTPO AMOLED is one of the best smartphone displays in 2025 — 2,600-nit peak brightness, 120Hz, sharp and bright in any lighting.
Short-burst performance from the Snapdragon 8 Elite for Galaxy + 12GB RAM matches or beats the S25 Ultra in single-shot benchmarks, with no noticeable lag in everyday use.
The 200MP main sensor (inherited from the S25 Ultra) takes genuinely strong photos with crisp detail, and the new wider 12MP selfie camera is a small upgrade for group shots.
Samsung commits seven years of OS and security updates, matching the industry's best long-term support window.
Cons
The 3,900 mAh battery is the smallest in the entire Galaxy S25 lineup — smaller even than the base S25's cell — and real-world endurance trails the S25+, S25 Ultra and most rivals by a meaningful margin.
There is no telephoto camera at all — only the 200MP main and a 12MP ultrawide — making it the only S25 phone without optical zoom and a hard sell for anyone who shoots distant subjects.
Under sustained 3DMark stress tests Notebookcheck measured GPU performance dropping to roughly half its initial score (46.3% Wild Life stability), confirming the slim chassis can't dissipate enough heat for long gaming sessions.
Wired charging is capped at 25W and wireless at 15W — well behind the OnePlus 13 and Xiaomi rivals, with a full charge taking about 1 hour 20 minutes from the wall.
Samsung skipped the new silicon-carbon battery chemistry already shipping in the OnePlus 13, Xiaomi 15, Vivo X200 and other competitors — the single technology that could have made the thin form factor work, repeatedly flagged by MKBHD, Dave2D and Mrwhosetheboss.
Samsung Galaxy S25 Edge
At 5.8mm and 163 grams the S25 Edge is the thinnest and lightest Galaxy flagship ever, and nearly every reviewer concedes that picking it up changes their opinion of thin phones — even those who came in skeptical. The frame is grade-5 titanium with Gorilla Glass Ceramic 2 (a smartphone first) on the front and Victus 2 on the back, IP68 rating preserved. The camera bump protrudes enough that the phone wobbles noticeably on a flat surface, and several reviewers point out a case immediately negates the thin-phone benefit.
After living with the Edge for two weeks, the lighter weight repeatedly tricked the reviewer into thinking she'd left her phone at home — the slimmer dimensions make a tangible difference in pockets and small bags the way no other modern big phone does.
At 5.8mm it is 2mm thinner than the iPhone 16 Plus and weighs 36 grams less despite the same 6.7-inch screen — picking it up genuinely feels strange and, surprisingly, not cheap.
Samsung kept the titanium frame and IP68 rating, and the Gorilla Glass Ceramic 2 panel is a smartphone first — the Edge is undeniably enchanting in sheer feel and aesthetics.
The titanium frame meets the glass at a minutely chamfered edge that banishes the sharp digging-into-the-palm sensation of the S25 Ultra — for an hour straight it never once felt fatiguing.
The Edge ruined the reviewer's previously positive experience with the S25 Ultra in 24 hours — the Ultra suddenly feels thick and noticeably heavy by comparison.
Even on video of his own hands holding it the difference looks subtle, but it is very noticeably thinner to hold — the kind of feel-it-to-believe-it engineering you don't get from a spec sheet.
Picking up the Edge was very reminiscent of his first time picking up a MacBook Air or a new iPad — 30% thinner and 25% lighter doesn't sound transformative on paper but absolutely feels it.
Just under 4mm thick, the camera bump on the back is quite prominent — including the lenses the Edge is almost as thick as the S25+, and on a table it wobbles back and forth considerably.
The phone rocks a lot on a table due to the camera bump and even with a case the Edge won't stop wobbling because case-makers want to preserve as much thinness as possible.
Display
ASUS Zenfone 12 Ultra
A big, bright 6.78-inch 144Hz AMOLED that's very good in practice — but it's FHD+, not the QHD some expect from an 'Ultra'.
It's a 6.78-inch LTPO AMOLED at 144Hz, HDR10, with 1,600 nits HBM / 2,500 nits peak at 1080x2400 (20:9), with an always-on display — unchanged from the 11 Ultra.
Peak brightness hits 2,500 nits with a real-hero ~2,200 nits at 20% APL — though minimum brightness is a bit high at almost 6 nits.
It's an LTPO 1–120Hz panel with a boosted 144Hz refresh mode available during gaming.
Calling it an 'Ultra' but shipping no QHD screen is a recurring criticism among buyers.
Samsung Galaxy S25 Edge
The 6.7-inch QHD+ LTPO AMOLED is essentially the same panel as the S25+ — 120Hz, sharp, very bright. Samsung says it skipped the S25 Ultra's anti-reflective Gorilla Armor 2 coating because the coating itself would have added thickness, so the Edge gets the glossier finish back. PWM dimming only reaches 480Hz which Notebookcheck flags as a potential issue for sensitive eyes.
The 6.7-inch panel is just as vibrant and wonderfully colourful as the S25+ — same OLED, same 120Hz refresh rate, no compromise on screen quality.
With auto-brightness enabled the panel exceeded 2,600 nits in HDR content and regularly cleared 1,000 nits, with even the manual SDR brightness boost hitting 700–800 nits in real testing.
Slimmer bezels on an absolutely gorgeous display make the Edge feel like holding a portal — and the 2,600 nit peak brightness is right in line with the S25 Ultra's spec.
The display is also fantastic, and the QHD+ AMOLED is one of the highlights of using the phone — battery aside, the screen alone makes the Edge a treat.
Samsung skipped the Ultra's anti-reflective coating because — and this is on the record — Samsung says the coating itself would have increased the phone's thickness.
The Ultra's anti-reflective glass is missing on the Edge — losing that anti-glare property is genuinely a downgrade if you've used the S25 Ultra outdoors.
Battery & Charging
ASUS Zenfone 12 Ultra
Strong real-world endurance from the 5,500mAh cell with fast 65W charging — though lab testing shows a regression versus the 11 Ultra.
The 5,500mAh battery delivered an easy 10–11 hours of screen-on time across a mix of socials, YouTube and light gaming.
65W wired charging takes it 0–100% in roughly 39–45 minutes, with 15W wireless and 10W reverse wired charging.
GSMArena's testing showed a regression — the 11 Ultra hit ~17h14m of battery life versus ~14h11m for the 12 Ultra.
It carries an IP68 rating and a large 5,500mAh cell — strong stamina credentials for the class.
One tester reported no wireless charging on their unit, though most sources confirm 15W wireless is supported.
Samsung Galaxy S25 Edge
The 3,900 mAh cell is the smallest in the entire S25 family — even smaller than the base S25's 4,000 mAh battery. Engadget's local video rundown clocked 25 hours 59 minutes (about 3.5 hours less than the Ultra and two hours less than the standard S25); Notebookcheck reached almost 18 hours of simulated web browsing. Real-world experience is split: The Verge survived a heavy Google I/O day with 20% left; Wired needed mid-day top-ups; Trusted Reviews hit 5% by midday after only two hours of screen-on time. Wired charging caps at 25W. The single most-flagged complaint is Samsung's decision not to use silicon-carbon battery tech that competitors already ship.
A full day covering Google I/O with three hours of screen time and an hour-ish of hotspot use ended with 20 percent left — not amazing, but fine for a heavy use day if you can plug in by evening.
Engadget's local video rundown lasted 25 hours 59 minutes — about three and a half hours less than the S25 Ultra and two hours less than the base S25.
Almost 18 hours of simulated web browsing and over 25 hours of HD video playback in lab testing — sufficient for a day of intensive use even if it doesn't quite beat similarly priced rivals.
At $1,099 the Edge sits between the cheaper S25+ ($999) and the only-$100-more S25 Ultra ($1,299), and reviewers across The Verge, Wired, GSMArena and Ars Technica agree neither end of that bracket is a comfortable place to land given what you give up.
Wireless charging works through a 'Qi2 Ready' label rather than built-in magnets — you need a separate magnetic case for MagSafe-style accessories, the same issue Engadget called out on the S25 Ultra.
There is no S Pen support and no S Pen slot — the Ultra's signature feature is gone, removing the one reason you'd traditionally pay over $1,000 for a Samsung flagship without compromise.
At $1,099 the Edge sits between the cheaper S25+ ($999) and the only-$100-more S25 Ultra ($1,299), and reviewers across The Verge, Wired, GSMArena and Ars Technica agree neither end of that bracket is a comfortable place to land given what you give up.
Wireless charging works through a 'Qi2 Ready' label rather than built-in magnets — you need a separate magnetic case for MagSafe-style accessories, the same issue Engadget called out on the S25 Ultra.
There is no S Pen support and no S Pen slot — the Ultra's signature feature is gone, removing the one reason you'd traditionally pay over $1,000 for a Samsung flagship without compromise.
The AMOLED flickers at a comparatively low 240Hz at minimum brightness rising to 480Hz at higher levels, and the amplitude isn't particularly flat — PWM-sensitive viewers may notice eye strain.
After only four hours of screen-on time the phone hit 15% — only light-to-average use will get you a full day, and travelling I/O coverage required mid-afternoon charging anxiety.
Off a full charge at 3pm, the phone hit 30% by morning and 5% by midday with only two hours of total screen time — Trusted Reviews calls this 'the phone that reintroduces battery anxiety' for the modern era.
Wired charging tops out at 25W and a full charge takes 1 hour 20 minutes — pedestrian numbers for a smartphone in this price category.
The Edge sticks with regular lithium-ion battery tech, not the silicon-carbon anode chemistry rivals like the OnePlus 13, Xiaomi 15, Vivo X200 and several Honor phones already ship — a 15–20% battery boost left on the table.
Skipping silicon-carbon was 'a big miss' — if Samsung had used it, the same thin chassis could have held meaningfully more capacity and the battery debate would have evaporated.
If this were a more energy-dense silicon-carbon battery the conversation would be entirely different — but it isn't, and within a few years as the cell degrades buyers may regret prioritising thinness over capacity.
Wireless charging is 'Qi2 Ready' rather than fully Qi2 compatible — there are no magnets inside the phone, so MagSafe-style accessories require a separate magnetic case or adhesive ring.
