Vivo X300 Ultra vs Xiaomi 13 Ultra

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.
• 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 13 Ultra

The 6.73" LTPO AMOLED at QHD+ 120Hz with Dolby Vision and HDR10+ is among the best smartphone panels of 2023 — 2,600-nit peak brightness, though only briefly under direct sunlight as Wired notes.

• 6.73" LTPO AMOLED, 120Hz, 1300 nits HBM / 2,600 nits peak, Dolby Vision + HDR10+, 68B colors.
• Wired: 'among the best I've laid eyes on' — display quality matches the photographic ambitions.
• 2,600-nit peak is marketing-deceptive — entire screen rarely (if ever) goes that high; sustained brightness ~500 nits in standard slider use.
• Notebookcheck: 'one of the best LTPO panels on the smartphone market' — panel quality consensus is strong.

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 13 Ultra

Snapdragon 8 Gen 2 + 16GB RAM delivers flagship-class performance with strong thermal headroom — Xiaomi's tune is among the best of 2023 SD 8 Gen 2 phones for sustained tasks.

• Snapdragon 8 Gen 2 + 16GB RAM + 512GB UFS 4.0 storage — top-tier 2023 silicon and the most RAM of any flagship phone.
• Wired: 'a smooth operator' with Snapdragon 8 Gen 2 + 12GB RAM (global variant) — no real-world performance complaints.

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.
• In a head-to-head charge race against the Oppo Find X9 Ultra (80W), the Vivo on 100W finished first at 50 minutes 20 seconds to the Oppo's 52:39.

Xiaomi 13 Ultra

5,000mAh battery + class-leading 90W wired and 50W wireless charging — Reddit's drain shootout placed it ahead of S22 Ultra, OnePlus 11, and Pixel 7 Pro at 10h 26min total SOT.

• 5,000mAh battery + 90W wired (full in ~35 min per Xiaomi) + 50W wireless (full in ~49 min) + 10W reverse wireless.
• Wired charge test: 34% to 63% in just 10 minutes — fantastic real-world charging speed.
• GSMArena endurance: 15h 29min web browsing, 19h 13min video looping — par with Find X6 Pro, ahead of Vivo X90 Pro.
• Reddit drain shootout: 10h 26min total SOT — beat S22 Ultra (9h 43m) and OnePlus 11 (10h 16m); narrowly beaten by S23 Ultra (11h 15m) and iPhone 14 Pro Max (11h 25m).
• Camera-heavy use drains battery noticeably faster per r/Android — the photography workflow is the biggest endurance hit.