Samsung Galaxy S21 Ultra vs Xiaomi 17 Ultra
The Samsung Galaxy S21 Ultra (2021) runs on the Samsung Exynos 2100, while the Xiaomi 17 Ultra (2026) runs on the Qualcomm Snapdragon 8 Elite Gen 5; launch prices were $1199 and $999. By overall MobileRank rating, the Xiaomi 17 Ultra leads — 89/100 vs 61/100 (a 28-point difference). Key differences: the Xiaomi 17 Ultra has the bigger battery (6000 mAh vs 5000); the main camera is 108 MP vs 50 MP; the Xiaomi 17 Ultra is faster in AnTuTu (3,600,724 vs 1,074,182); per DXOMark lab testing, the Xiaomi 17 Ultra has the stronger camera (166 vs 117).
Profile comparison
Category scores
Samsung Galaxy S21 Ultra
Xiaomi 17 Ultra
What makes Samsung Galaxy S21 Ultra better?
- Better main camera: 108MP vs 50MP
- Overall rating 61/100
What makes Xiaomi 17 Ultra better?
- Higher AnTuTu: 3600724 vs 1074182
- Better Geekbench Single: 3639 vs 1435
- Better Geekbench Multi: 11047 vs 3555
- Bigger battery: 6000 vs 5000 mAh
- Faster charging: 90W vs 25W
- Faster wireless charging: 50W vs 15W
- Lighter: 226g vs 228g
- Cheaper at launch: $999 vs $1199
- Higher performance (97/100 vs 63/100)
- Better camera (93/100 vs 55/100)
- Longer battery life (80/100 vs 52/100)
- Better portability (40/100 vs 33/100)
Comparison verdict
Comparing the Samsung Galaxy S21 Ultra vs the Xiaomi 17 Ultra, the Xiaomi 17 Ultra scores 28 points higher (89/100 vs 61/100). In the "performance" category, the Xiaomi 17 Ultra leads (97/100 vs 63/100). In the "camera" category, the Xiaomi 17 Ultra leads (93/100 vs 55/100). In the "battery" category, the Xiaomi 17 Ultra leads (80/100 vs 52/100). Value score: Samsung Galaxy S21 Ultra — 32/100, Xiaomi 17 Ultra — 88/100; it shows how far a model sits above or below the usual level for its price, and is not part of the overall rating. In the "performance" category, the Xiaomi 17 Ultra significantly outperforms the Samsung Galaxy S21 Ultra (97/100 vs 63/100). In the "display" category, both devices are on the same level — 89/100. In the "camera" category, the Xiaomi 17 Ultra significantly outperforms the Samsung Galaxy S21 Ultra (93/100 vs 55/100). In the "battery" category, the Xiaomi 17 Ultra notably outperforms the Samsung Galaxy S21 Ultra (80/100 vs 52/100). In the "portability" category, the Xiaomi 17 Ultra is a bit better (40/100 vs 33/100).
Specs comparison
| Specification | Samsung Galaxy S21 Ultra | Xiaomi 17 Ultra | |
|---|---|---|---|
| Processor | Samsung Exynos 2100 | Qualcomm Snapdragon 8 Elite Gen 5 | |
| AnTuTu | 1074182 | 3600724 | |
| Geekbench Single | 1435 | 3639 | |
| Geekbench Multi | 3555 | 11047 | |
| Display | 6.8" AMOLED | 6.8" LTPO AMOLED | |
| Resolution | 3200x1440 | 3200x1440 | |
| Refresh rate | 120 Hz | 120 Hz | |
| Battery | 5000 mAh | 6000 mAh | |
| Charging | 25W | 90W | |
| Wireless charging | 15W | 50W | |
| DXOMark (camera) | 117 | 166 | |
| Main camera | 108 MP | 50 MP | |
| Ultrawide | 12 MP | 50 MP | |
| Telephoto | 10 MP | 200 MP | |
| Front camera | 40 MP | 32 MP | |
| RAM | 12GB / 16GB | 12GB / 16GB | |
| Storage | 128GB / 256GB / 512GB | 256GB / 512GB / 1TB | |
| OS | Android 11 | Android 16 | |
| Brightness (peak) | 1500 nits | 3500 nits | |
| NFC | yes | yes | |
| Protection | IP68 | IP68 | |
| Dimensions | 165.1×75.6×8.9 mm | 162.9×77.6×8.3 mm | |
| Weight | 228 g | 226 g | |
| Launch price | $1199 | $999 |
Camera comparison
Samsung Galaxy S21 Ultra
- Main: 108MP f/1.8
- Ultrawide: 12MP
- Telephoto: 10MP
- Front: 40MP
Xiaomi 17 Ultra
- Main: 50MP f/1.63
- Ultrawide: 50MP
- Telephoto: 200MP
- Front: 32MP
Display comparison
Samsung Galaxy S21 Ultra
- 6.8" AMOLED
- Resolution: 3200x1440
- Refresh rate: 120 Hz
Xiaomi 17 Ultra
- 6.8" LTPO AMOLED
- Resolution: 3200x1440
- Refresh rate: 120 Hz
Battery and charging
Samsung Galaxy S21 Ultra
- 5000 mAh
- Wired: 25W
- Wireless: 15W
Xiaomi 17 Ultra
- 6000 mAh
- NanoReview test: web browsing 16:09 hrs, total 33:23 hrs
- Wired: 90W
- Wireless: 50W
Overall performance score
We compared Samsung Galaxy S21 Ultra and Xiaomi 17 Ultra, covering their specs and all relevant benchmarks.
Xiaomi 17 Ultra leads Samsung Galaxy S21 Ultra by 70.2% in our overall performance rating.
Benchmarks
Launch prices and where to check today's
Launch price difference: $200. Xiaomi 17 Ultra was $200 cheaper at launch.
Detailed category analysis
performance
In the "performance" category, the Xiaomi 17 Ultra significantly outperforms the Samsung Galaxy S21 Ultra (97/100 vs 63/100).
display
In the "display" category, both devices are on the same level — 89/100.
camera
In the "camera" category, the Xiaomi 17 Ultra significantly outperforms the Samsung Galaxy S21 Ultra (93/100 vs 55/100).
battery
In the "battery" category, the Xiaomi 17 Ultra notably outperforms the Samsung Galaxy S21 Ultra (80/100 vs 52/100).
portability
In the "portability" category, the Xiaomi 17 Ultra is a bit better (40/100 vs 33/100).
Frequently asked questions
Which is better: the Samsung Galaxy S21 Ultra or the Xiaomi 17 Ultra?
The Xiaomi 17 Ultra significantly outperforms the Samsung Galaxy S21 Ultra by 28 points (89/100 vs 61/100).
What is the rating of the Samsung Galaxy S21 Ultra and the Xiaomi 17 Ultra?
The Samsung Galaxy S21 Ultra has a MobileRank rating of 61/100, the Xiaomi 17 Ultra — 89/100.
Which has the better camera: the Samsung Galaxy S21 Ultra or the Xiaomi 17 Ultra?
The Xiaomi 17 Ultra leads on camera score (93/100 vs 55/100).
Which is more powerful: the Samsung Galaxy S21 Ultra or the Xiaomi 17 Ultra?
The Xiaomi 17 Ultra leads on performance (97/100 vs 63/100).
Should you choose the Samsung Galaxy S21 Ultra over the Xiaomi 17 Ultra?
The Samsung Galaxy S21 Ultra is a better fit for active users. The Xiaomi 17 Ultra is a better fit for gamers and power users, mobile photography enthusiasts, those who care about battery life, budget-conscious buyers.