Both are fast. The POCO costs noticeably more, but gives you a flagship chip and a huge battery.

Short answer

POCO X8 Pro Max - Dimensity 9500s, 8500 mAh, 100 W, IP68, 12/256 GB as standard. OnePlus Nord 5 - 144 Hz, a 50 MP front camera and much cheaper.

Key differences

SpecPOCO X8 Pro MaxOnePlus Nord 5
ChipMediaTek Dimensity 9500sQualcomm Snapdragon 8s Gen 3
Display6.83", AMOLED, 1280×2772, 120 Hz6.83", AMOLED, 1272×2800, 144 Hz
RAM / storage12/256 GB, 12/512 GB8/256 GB, 12/512 GB
Rear cameras50 MP + 8 MP50 MP + 8 MP
Front20 MP50 MP
Battery8500 mAh5200 mAh
Charging100 W80 W
ProtectionIP68IP65
Thickness / weight8.2 mm / 218 g211 g
Pricecurrent pricescurrent prices

Specs come from the device pages on Smartphone.ua.

Chips

MediaTek Dimensity 9500s and Qualcomm Snapdragon 8s Gen 3. The Dimensity 9500s is newer and more powerful.

Battery

8500 vs 5200 mAh.

Protection

IP68 on the POCO vs IP65 on the OnePlus.

Verdict: who should buy which

  • Maximum speed and battery life - POCO X8 Pro Max.
  • Price and 144 Hz - OnePlus Nord 5.

FAQ

What charging does the POCO have?
100 W.

What front camera does the OnePlus have?
50 MP.

Which is cheaper?
The OnePlus Nord 5.

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