The camera system — twin ~1-inch 200MP main and 200MP 85mm periscope plus a large ultrawide — is the best-equipped on any 2026 phone and the entire reason the device exists.
Video is class-leading: 4K 120fps 10-bit Log with Dolby Vision recorded on-device (no SSD), 8K30 across the rear cameras, and 4K 60fps on every lens including the selfie.
Battery life is genuinely strong — roughly 16 hours active-use score, ~7h heavy screen-on time, and 13–14 hour days with charge to spare, on the 6,600mAh cell.
The Zeiss 200mm/400mm telephoto extenders deliver real, usable optical reach (8.7x and 17.4x) with surprisingly good handheld stabilisation.
100W wired charging refills the big battery in roughly 46–50 minutes, with 40W wireless on top.
Pros & Cons
Vivo X300 Ultra
Pros
The camera system — twin ~1-inch 200MP main and 200MP 85mm periscope plus a large ultrawide — is the best-equipped on any 2026 phone and the entire reason the device exists.
Video is class-leading: 4K 120fps 10-bit Log with Dolby Vision recorded on-device (no SSD), 8K30 across the rear cameras, and 4K 60fps on every lens including the selfie.
Battery life is genuinely strong — roughly 16 hours active-use score, ~7h heavy screen-on time, and 13–14 hour days with charge to spare, on the 6,600mAh cell.
The Zeiss 200mm/400mm telephoto extenders deliver real, usable optical reach (8.7x and 17.4x) with surprisingly good handheld stabilisation.
Detailed Comparison
Display
Vivo X300 Ultra
A 6.82-inch 144Hz LTPO AMOLED, now flat rather than quad-curved. Lab measurements put real brightness near 1,900 nits in auto and ~3,300 nits on a small window — among the best panels on any phone — and reviewers single out content consumption and clarity as standouts.
We measured a maximum of over 1,900 nits in auto-brightness mode and over 3,300 nits when lighting up a smaller portion of the screen.
Consuming content, scrolling the web, pixel-peeping and zooming in on text — it doesn't get any clearer, or with the 144Hz any smoother, than the display on the X300 Ultra.
It delivers an excellent max brightness of around 1,935 nits with a 75% white pattern and a peak of 3,328 nits with a 10% pattern.
Vivo has gone with a flat display this time, a clear shift from the quad-curved style of the X200 Ultra.
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The 6.82-inch 144Hz LTPO AMOLED is among the best displays available, hitting ~1,900 nits in auto and ~3,300 nits peak.
Deal Breakers
The 35mm (~1.5x) default main focal length is polarising — many reviewers find it too tight/zoomed versus the usual 24mm.
It heats up quickly under sustained camera or gaming load and throttles to roughly 60–65% stability in prolonged stress tests.
The full experience needs the expensive Photography Kit — the global bundle approaches €2,600 and the 200mm lens isn't in every box.
Notebookcheck found it 'hardly better than the X300 Pro in camera performance despite top-notch hardware', and Linus preferred Oppo's less over-sharpened processing.
It launched in China first with a rocky early software state (fixed via updates), and global availability/pricing is limited and steep.
Xiaomi 15 Pro
What Reviewers Agree On
Snapdragon 8 Elite delivers top-tier performance with excellent thermal management
Battery life is class-leading thanks to the 6,100mAh silicon-carbon cell and efficient display
Display quality is outstanding with 3,200 nits brightness and remarkable power efficiency
Camera system is good but not best-in-class — ultrawide is the weakest lens
China-only availability is a significant limitation for global buyers
Deal Breakers
No global availability — Chinese ROM only with no Google services out of the box
HyperOS described as bloated with unnecessary apps
Bootloader cannot be unlocked on Chinese ROM versions
100W wired charging refills the big battery in roughly 46–50 minutes, with 40W wireless on top.
The 6.82-inch 144Hz LTPO AMOLED is among the best displays available, hitting ~1,900 nits in auto and ~3,300 nits peak.
Cons
The 35mm (~1.5x) default main focal length is polarising — many reviewers find it too tight/zoomed versus the usual 24mm.
It heats up quickly under sustained camera or gaming load and throttles to roughly 60–65% stability in prolonged stress tests.
The full experience needs the expensive Photography Kit — the global bundle approaches €2,600 and the 200mm lens isn't in every box.
Notebookcheck found it 'hardly better than the X300 Pro in camera performance despite top-notch hardware', and Linus preferred Oppo's less over-sharpened processing.
It launched in China first with a rocky early software state (fixed via updates), and global availability/pricing is limited and steep.
Xiaomi 15 Pro
Pros
Snapdragon 8 Elite delivers top-tier performance with excellent thermal management
Battery life is class-leading thanks to the 6,100mAh silicon-carbon cell and efficient display
Display quality is outstanding with 3,200 nits brightness and remarkable power efficiency
Camera system is good but not best-in-class — ultrawide is the weakest lens
China-only availability is a significant limitation for global buyers
Cons
No global availability — Chinese ROM only with no Google services out of the box
HyperOS described as bloated with unnecessary apps
Bootloader cannot be unlocked on Chinese ROM versions
It's a 6.82-inch AMOLED with a claimed 4,500-nit HDR peak that can reach that figure in a one-person window watching HDR content; PWM sits around 3.5% at max brightness, better for flicker-sensitive users.
An absolutely stunning display with terrific, bass-heavy stereo speakers to match.
Xiaomi 15 Pro
The 6.73-inch 2K LTPO AMOLED is a technical marvel, hitting 3,200 nits peak brightness while consuming 24% less power than the Xiaomi 14 Pro's display. The 1920Hz PWM dimming reduces eye strain, though some users report OLED smear at low brightness levels.
3,200 nits peak brightness with 24% lower power consumption than the predecessor — outstanding efficiency
2K resolution (2670x1200) with 120Hz LTPO and 1920Hz PWM dimming for reduced eye strain
Reports of OLED smear/ghosting at lower brightness levels when scrolling dark content
Performance
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.
Xiaomi 15 Pro
The Snapdragon 8 Elite (3nm) delivers a 44% single-core improvement over the previous generation and manages thermals better than most competitors. NotebookCheck awarded a 99% application performance score, placing it among the fastest phones available.
Snapdragon 8 Elite achieves Geekbench 6 single-core of 3,157 — a 44.4% leap over Snapdragon 8 Gen 3
Better thermal management and sustained performance than competitors like the Oppo Find X8 Pro
Some throttling under prolonged heavy gaming loads, though managed better than peers
Software & Updates
Vivo X300 Ultra
Origin OS 6 (Funtouch with full Google services on the global model) is clean and not over-baked with AI, and Vivo now commits to 5 OS upgrades plus 7 years of security patches. The launch software was rough but patched quickly; there's no longer a configurable camera action button.
Despite being a Chinese device using Google services, you get 5 years of OS updates and 7 years of security updates — a solid, much-improved commitment.
AI is present across the camera and day-to-day tools, but unlike Samsung you don't have to use AI in every single sense — it's not overbaked to the nth degree.
Origin OS 6 introduces more transparency in the UI; brands like Vivo and Oppo have changed a lot over the past two years, easing the usual Chinese-variant fears.
Being the first global launch for a Vivo Ultra there was an early-software rough patch, but an update arrived about 4 days later — the kind of thing Vivo can fix easily via software.
Disappointingly there's no longer an extra configurable camera button like some previous Vivos and rivals from Oppo and Honor offer — though one reviewer was glad the old, unusable button was removed.
Vivo's drag-and-drop is genuinely better than Oppo's — you can pick up an item and drop it straight into your most-used apps rather than parking it in a file dock first.
Xiaomi 15 Pro
HyperOS 2 based on Android 15 brings improved fluency over HyperOS 1 and is now receiving the HyperOS 3/Android 16 update. However, the Chinese ROM lacks Google services out of the box, and the community considers HyperOS bloated with unnecessary apps compared to stock Android.
HyperOS 2 offers "substantially improved fluency and stability" over the first version
Chinese ROM only — no Google services out of the box, no Android Auto, limited language support
HyperOS described as "full of unnecessary apps" — bootloader cannot be unlocked on Chinese ROM
