Samsung Galaxy S21 Ultra vs Xiaomi 15 Ultra
37.2Performance79.1
56.3Display69.1
72Camera73.2
46.4Battery79
78.7Features78.7
5 spec wins — Samsung Galaxy S21 Ultra12 spec wins — Xiaomi 15 Ultra
InnoReviews verdict
Xiaomi 15 Ultra wins this phone face-off, 75.9 to 53.9, pulling ahead mainly in performance (+42) and battery (+33). Samsung Galaxy S21 Ultra still makes sense if its price or standout specs fit your needs better.
Which would you pick?
Key differences
Reasons to pick the Samsung Galaxy S21 Ultra
- 133% higher Optical zoom: 10 x vs 4.3 x
- 116% higher Main camera: 108 MP vs 50 MP
- 25% higher Front camera: 40 MP vs 32 MP
- Lower launch price: $1,199 vs $1,499
Reasons to pick the Xiaomi 15 Ultra
- Stronger performance score: 79 vs 37
- Stronger display score: 69 vs 56
- Stronger battery score: 79 vs 46
- 1900% higher telephoto: 200 MP vs 10 MP
- 433% higher Wireless charging: 80 W vs 15 W
Display
| Spec | Samsung Galaxy S21 Ultra | Xiaomi 15 Ultra |
|---|---|---|
| Screen size | 6.8 ″+1% | 6.73 ″ |
| Panel type | LTPO AMOLED | LTPO AMOLED |
| Resolution | 3200x1440 | 1440x3200 |
| Pixel density | 515 ppi | 522 ppi+1% |
| Refresh rate | 120 Hz | 120 Hz |
| Peak brightness | 1,500 nits | 3,200 nits+113% |
| Screen-to-body | — | 90 % |
| AnTuTu 10 (CPU) | 263,424Top 88% | — |
| AnTuTu 10 (GPU) | 126,989Top 82% | — |
| AnTuTu 10 (Memory) | 165,563Top 72% | — |
| AnTuTu 10 (UX) | 227,841Top 82% | — |
Performance
| Spec | Samsung Galaxy S21 Ultra | Xiaomi 15 Ultra |
|---|---|---|
| Chipset | Samsung Exynos 2100 | Snapdragon 8 Elite |
| AnTuTu 10 | 783,817Top 65% | 2,650,000+238%Top 4% |
| Geekbench 6 (single) | 1,430Top 52% | 3,050+113%Top 7% |
| Geekbench 6 (multi) | 3,550Top 56% | 9,600+170%Top 5% |
| RAM (max) | 12 GB | 16 GB+33% |
| Storage options | 128GB / 256GB / 512GB | 256/512GB/1TB |
| Storage type | UFS 3.1 | UFS 4.1 |
Camera
| Spec | Samsung Galaxy S21 Ultra | Xiaomi 15 Ultra |
|---|---|---|
| Main camera | 108 MP+116% | 50 MP |
| Main aperture | f/1.8 | f/1.63 |
| Ultra-wide | 12 MP | 50 MP+317% |
| Telephoto | 10 MP | 200 MP+1900% |
| Optical zoom | 10 x+133% | 4.3 x |
| Max video | 8K@24fps | 8K@30fps |
| Front camera | 40 MP+25% | 32 MP |
| OIS | Yes | Yes |
Battery
| Spec | Samsung Galaxy S21 Ultra | Xiaomi 15 Ultra |
|---|---|---|
| Capacity | 5,000 mAh | 5,410 mAh+8% |
| Wired charging | 25 W | 90 W+260% |
| Wireless charging | 15 W | 80 W+433% |
| Active use endurance | — | 12 h |
Design
| Spec | Samsung Galaxy S21 Ultra | Xiaomi 15 Ultra |
|---|---|---|
| Weight | 228 g | 226 g+1% |
| Thickness | 8.9 mm+5% | 9.4 mm |
| IP rating | IP68 | IP68 |
| Frame material | Aluminum | Aluminum |
Connectivity
| Spec | Samsung Galaxy S21 Ultra | Xiaomi 15 Ultra |
|---|---|---|
| 5G | Yes | Yes |
| Wi-Fi | Wi-Fi 6E | Wi-Fi 7 |
| Bluetooth | 5.2 | 6.0 |
| NFC | Yes | Yes |
| USB | USB-C 3.2 | USB-C 3.2 |
| eSIM | Yes | Yes |
Software
| Spec | Samsung Galaxy S21 Ultra | Xiaomi 15 Ultra |
|---|---|---|
| OS at launch | Android 11 (One UI 3.1) | Android 15 (HyperOS 2) |
| OS update pledge | 4 years | 4 years |
Audio
| Spec | Samsung Galaxy S21 Ultra | Xiaomi 15 Ultra |
|---|---|---|
| Stereo speakers | Yes | Yes |
| 3.5mm jack | No | No |
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