Samsung Galaxy S21 Ultra vs Xiaomi 15S Pro
The Samsung Galaxy S21 Ultra (2021) runs on the Samsung Exynos 2100, while the Xiaomi 15S Pro (2025) runs on the Xiaomi XRING O1; launch prices were $1199 and $760. By overall MobileRank rating, the Xiaomi 15S Pro leads — 84/100 vs 61/100 (a 23-point difference). Key differences: the Xiaomi 15S Pro has the bigger battery (6100 mAh vs 5000); the main camera is 108 MP vs 50 MP; the Xiaomi 15S Pro is faster in AnTuTu (2,998,904 vs 1,074,182).
Samsung Galaxy S21 Ultra
Xiaomi 15S Pro
- Better main camera: 108MP vs 50MP
- Overall rating 61/100
- Higher AnTuTu: 2998904 vs 1074182
- Better Geekbench Single: 2746 vs 1435
- Better Geekbench Multi: 8431 vs 3555
- Bigger battery: 6100 vs 5000 mAh
- Faster charging: 90W vs 25W
- Cheaper at launch: $760 vs $1199
- Higher performance (89/100 vs 63/100)
- Better camera (78/100 vs 55/100)
- Longer battery life (77/100 vs 52/100)
- Better display (90/100 vs 89/100)
Comparing the Samsung Galaxy S21 Ultra vs the Xiaomi 15S Pro, the Xiaomi 15S Pro scores 23 points higher (84/100 vs 61/100). In the "performance" category, the Xiaomi 15S Pro leads (89/100 vs 63/100). In the "camera" category, the Xiaomi 15S Pro leads (78/100 vs 55/100). In the "battery" category, the Xiaomi 15S Pro leads (77/100 vs 52/100). Value score: Samsung Galaxy S21 Ultra — 32/100, Xiaomi 15S Pro — 80/100; it is biased by price level, so it should not be compared directly between devices at different prices. In the "performance" category, the Xiaomi 15S Pro notably outperforms the Samsung Galaxy S21 Ultra (89/100 vs 63/100). In the "display" category, the Xiaomi 15S Pro and the Samsung Galaxy S21 Ultra are nearly equal (90/100 vs 89/100). In the "camera" category, the Xiaomi 15S Pro notably outperforms the Samsung Galaxy S21 Ultra (78/100 vs 55/100). In the "battery" category, the Xiaomi 15S Pro notably outperforms the Samsung Galaxy S21 Ultra (77/100 vs 52/100).
| Specification | Samsung Galaxy S21 Ultra | Xiaomi 15S Pro | |
|---|---|---|---|
| Processor | Samsung Exynos 2100 | Xiaomi XRING O1 | |
| AnTuTu | 1074182 | 2998904 | |
| Geekbench Single | 1435 | 2746 | |
| Geekbench Multi | 3555 | 8431 | |
| Display | 6.8" AMOLED | 6.7" LTPO AMOLED | |
| Resolution | 3200x1440 | 3200x1440 | |
| Refresh rate | 120 Hz | 120 Hz | |
| Battery | 5000 mAh | 6100 mAh | |
| Charging | 25W | 90W | |
| Wireless charging | 15W | — | |
| DXOMark (camera) | 117 | — | |
| Main camera | 108 MP | 50 MP | |
| Ultrawide | 12 MP | 50 MP | |
| Telephoto | 10 MP | 50 MP | |
| Front camera | 40 MP | 32 MP | |
| RAM | 12GB / 16GB | 16GB | |
| Storage | 128GB / 256GB / 512GB | 512GB / 1TB | |
| OS | Android 11 | Android 15 | |
| Brightness (peak) | 1500 nits | — | |
| NFC | yes | — | |
| Protection | IP68 | — | |
| Dimensions | 165.1×75.6×8.9 mm | — | |
| Weight | 228 g | — | |
| Launch price | $1199 | $760 |
Samsung Galaxy S21 Ultra
- Main: 108MP f/1.8
- Ultrawide: 12MP
- Telephoto: 10MP
- Front: 40MP
Xiaomi 15S Pro
- Main: 50MP f/f/1.8
- Ultrawide: 50MP
- Telephoto: 50MP
- Front: 32MP
Samsung Galaxy S21 Ultra
- 6.8" AMOLED
- Resolution: 3200x1440
- Refresh rate: 120 Hz
Xiaomi 15S Pro
- 6.7" LTPO AMOLED
- Resolution: 3200x1440
- Refresh rate: 120 Hz
Samsung Galaxy S21 Ultra
- 5000 mAh
- Wired: 25W
- Wireless: 15W
Xiaomi 15S Pro
- 6100 mAh
- Wired: 90W
- Wireless charging: no data
We compared Samsung Galaxy S21 Ultra and Xiaomi 15S Pro, covering their specs and all relevant benchmarks.
Xiaomi 15S Pro leads Samsung Galaxy S21 Ultra by 64.2% in our overall performance rating.
Launch price difference: $439. Xiaomi 15S Pro was $439 cheaper at launch.
performance
In the "performance" category, the Xiaomi 15S Pro notably outperforms the Samsung Galaxy S21 Ultra (89/100 vs 63/100).
display
In the "display" category, the Xiaomi 15S Pro and the Samsung Galaxy S21 Ultra are nearly equal (90/100 vs 89/100).
camera
In the "camera" category, the Xiaomi 15S Pro notably outperforms the Samsung Galaxy S21 Ultra (78/100 vs 55/100).
battery
In the "battery" category, the Xiaomi 15S Pro notably outperforms the Samsung Galaxy S21 Ultra (77/100 vs 52/100).
Which is better: the Samsung Galaxy S21 Ultra or the Xiaomi 15S Pro?
The Xiaomi 15S Pro significantly outperforms the Samsung Galaxy S21 Ultra by 23 points (84/100 vs 61/100).
What is the rating of the Samsung Galaxy S21 Ultra and the Xiaomi 15S Pro?
The Samsung Galaxy S21 Ultra has a MobileRank rating of 61/100, the Xiaomi 15S Pro — 84/100.
Which has the better camera: the Samsung Galaxy S21 Ultra or the Xiaomi 15S Pro?
The Xiaomi 15S Pro leads on camera score (78/100 vs 55/100).
Which is more powerful: the Samsung Galaxy S21 Ultra or the Xiaomi 15S Pro?
The Xiaomi 15S Pro leads on performance (89/100 vs 63/100).
Should you choose the Samsung Galaxy S21 Ultra over the Xiaomi 15S Pro?
The Samsung Galaxy S21 Ultra is a better fit for active users. The Xiaomi 15S Pro is a better fit for gamers and power users, those who care about battery life, budget-conscious buyers.