ASUS Zenfone 12 Ultra vs Vivo X300 Ultra

ASUS Zenfone 12 Ultra

The gimbal-stabilized main camera is the genuine highlight; the rest of the system is solid-for-the-price but clearly trails rival flagships.

• Asus swapped the main camera sensor as part of a gimbal-stabilizer upgrade that now provides up to 66% better stabilization (6-axis, up to 5° each direction).
• The lead shooter promises gimbal-level stability when snapping or filming — the standout reason to consider this phone.
• The main camera captures 12.5MP pixel-binned stills; the ultrawide is limited to 4K30, the telephoto to 1080p60 and the selfie to 1080p30.
• Camera quality is subpar versus other flagships, with no autofocus on the wide-angle and the front camera capped at 1080p 30fps video.
• Photography and processing fall away once you push past 3x optical, where rivals with longer reach stay stronger.
• Asus confirmed the Zenfone 12 Ultra would launch with new AI camera features.

Vivo X300 Ultra

The reason the X300 Ultra exists: a near-1-inch 200MP 35mm main (Sony Lytia 901), a 200MP 85mm periscope, and the best ultrawide sensor on the market, tuned with Zeiss. Reviewers near-universally rate it the best-equipped camera phone of 2026 — with two important caveats: the 35mm default is divisive, and on raw image quality it's only marginally ahead of the cheaper X300 Pro.

• At the center is a 200MP main that's nearly a 1-inch sensor (Sony Lytia 901), backed by a 200MP 85mm-equivalent periscope telephoto — the phone is focused on camera quality and, even more so, video.
• Featuring three extra-large image sensors, the X300 Ultra's uncompromising camera hardware earned a solid rating — but it's hardly better than the cheaper X300 Pro in actual camera performance despite the top-notch hardware.
• I'm not sure I've seen better results from even 1-inch sensors — it's so close to 1-inch and the 35mm focal length makes for more cinematic-looking shots; the 85mm periscope is the sweet spot for portraits.
• It still holds the record for the best portrait-mode photos on a smartphone, especially at 85mm and 135mm; the 14mm ultrawide is sharp edge to edge.

ASUS Zenfone 12 Ultra

Snapdragon 8 Elite plus ROG-derived cooling makes this a fast, stable performer with no thermal drama.

• The Snapdragon 8 Elite provides excellent burst performance.
• Paired with up to 16GB RAM and UFS 4.0, load times are fast, app switching is seamless and gaming performance is rock solid.
• The most demanding titles held a steady frame rate with no lag and no overheating, impressive given the slim 8.9mm body.
• It carries thermal controls (limit CPU boost, dim brightness, disable 5G when hot) so you can tune sustained performance outdoors.
• Its gaming result was slightly better than the 11 Ultra despite the overall battery regression.

Vivo X300 Ultra

Snapdragon 8 Elite Gen 5 plus Vivo's custom imaging silicon delivers flagship benchmark numbers and strong gaming, but the camera-heavy hardware runs hot — sustained stress tests show roughly 60–65% stability and the camera app warms it up fast.

• At the heart is Qualcomm's current flagship Snapdragon 8 Elite Gen 5, supplemented by Vivo's custom VS1 and V3-Plus imaging chips.
• It boots in 16 seconds (vs 21s for the S26 Ultra and 19s for the iPhone 17 Pro Max) and posts an AnTuTu score over 3,800,000, stronger than Samsung.
• In a prolonged stress test it throttled CPU performance to about 60% of peak — in line with other high-powered flagships — and 3DMark stability landed around 63–66%.
• It gets a bit hot after 30–40 minutes of gaming, but with no throttling even past an hour and never uncomfortable to hold; boost mode at max graphics gives around 4 hours of Wuthering Waves on a full charge.
• Native 120fps gaming with smooth/very-high graphics in many titles, with temperature barely crossing 35°C and power draw around 4W in battle-royale modes.
• Under sustained camera/imaging load the front reached ~46.8°C and the back ~45.2°C, and around 47°C the refresh rate drops slightly though not all the way to 60Hz.

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.

Vivo X300 Ultra

Vivo grew the silicon-carbon cell 10% to 6,600mAh while keeping the body the same size. Real-world endurance is strong — ~16h active-use score, ~7h heavy screen-on, 13–14 hour days with charge to spare — and 100W wired refills it in under an hour, with 40W wireless.

• Vivo increased the battery by 10% to 6,600mAh despite the phone being practically the same size on paper.
• In our battery test it earned an active-use score of almost 16 hours; 100W charging took it 0–66% in 30 minutes and a full charge in 46 minutes, plus 40W wireless. A charger is in the box except in Europe.
• On the China version I'm finishing entire 13–14 hour days with 25–30% left; the global version keeps the 6,600mAh cell so battery life should comfortably last 12–13 hours of heavy use.
• Getting nearly 7 hours of screen-on time with very heavy usage from the 6,600mAh silicon-carbon unit, with 100W wired and 40W wireless charging support.
• After a 4-hour heavy-usage simulation the phone still had ~45% battery left, which is solid by today's standards, and 100W wired charging takes about 45 minutes to full.