Samsung Galaxy S21+ vs Xiaomi 15 Pro
The Verdict
Samsung's Galaxy S21+ delivers a polished flagship experience with excellent build quality and reliable performance, but the Xiaomi 15 Pro substantially outclasses it across nearly every specification. Xiaomi's 50MP main sensor with f/1.44 aperture and 1-inch type sensor crushes Samsung's 12MP option, while the 3200x1440 LTPO display with 3200 nits brightness far exceeds the S21+'s 1300-nit Dynamic AMOLED panel. Battery capacity tells the story clearly: Xiaomi packs 6100 mAh versus 4800 mAh, and charges at 90W wired versus 25W. The Snapdragon 8 Elite paired with 16GB RAM handily beats the older Snapdragon 888 with 8GB. Xiaomi includes 256GB base storage and Wi-Fi 7, while Samsung offers 128GB and Wi-Fi 6. Both maintain IP68 water resistance and support 5G. The $300 price gap heavily favors Xiaomi, which offers objectively superior hardware across imaging, display technology, processing power, and battery performance. Unless you require Samsung's software ecosystem or prefer One UI's interface specifically, the 15 Pro represents dramatically better value and capability at a significantly lower price point.
Who Should Buy
Buy the Samsung Galaxy S21+ if…
- →Large 4800 mAh battery with great endurance
- →120Hz AMOLED display
- →Gorilla Glass Victus durability
Buy the Xiaomi 15 Pro if…
- →Massive 6100 mAh battery easily lasts two full days
- →1-inch type main sensor captures outstanding low-light photos
- →2K LTPO display with 3200-nit brightness is class-leading
Category Scores
Pros & Cons
Samsung Galaxy S21+
Pros
- Large 4800 mAh battery with great endurance
- 120Hz AMOLED display
- Gorilla Glass Victus durability
- Good triple camera system
- Flat display is easier to use with screen protectors
Cons
- FHD+ only, no QHD option
- Plastic back on some regions (Glasstic)
- Slow 25W charging
- No microSD card slot (removed in S21 series)
- No charger in the box
Xiaomi 15 Pro
Pros
- Massive 6100 mAh battery easily lasts two full days
- 1-inch type main sensor captures outstanding low-light photos
- 2K LTPO display with 3200-nit brightness is class-leading
- 90W wired + 50W wireless charging is extremely fast
- Triple 50MP Leica camera system with 3x optical zoom
Cons
- Heavy at 213 g due to the large battery
- HyperOS software has ads and bloatware in some regions
- No 5x periscope — 3x telephoto is behind Samsung and Apple flagships
- Limited global market availability
Full Specifications
| Spec | Samsung Galaxy S21+ | Xiaomi 15 Pro |
|---|---|---|
| Software | Android 11, One UI 3.1 | Android 15 (HyperOS 2) |
| Body | ||
| Weight | 200 g | 213 g |
| Material | Aluminum frame, Gorilla Glass Victus | Aluminum frame, Gorilla Glass Victus 2 |
| IP rating | IP68 | IP68 |
| Dimensions | 161.5 x 75.6 x 7.8 mm | 161.3 x 75.0 x 8.35 mm |
| Camera | ||
| Main camera | 12 MP, f/1.8, OIS | 50 MP, f/1.44, OIS (1-inch type sensor) |
| Front camera | 10 MP, f/2.2 | 32 MP, f/2.0 |
| Video | 8K@24fps, 4K@60fps | 8K@24fps, 4K@60fps |
| Telephoto | 64 MP, f/2.0, 3x hybrid zoom | 50 MP, f/2.5, 3x optical zoom, OIS |
| Ultrawide | 12 MP, f/2.2 | 50 MP, f/2.2, 115-degree |
| Memory | ||
| RAM | 8 GB | 16 GB |
| Storage options | 128 GB, 256 GB | 256 GB, 512 GB |
| Battery | ||
| Capacity | 4800 mAh | 6100 mAh |
| Charging | 25W wired | 90W wired |
| Wireless charging | 15W wireless | 50W wireless |
| Display | ||
| Size | 6.7 inches | 6.73 inches |
| Type | Dynamic AMOLED 2X | LTPO AMOLED |
| Resolution | 2400 x 1080 | 3200 x 1440 |
| Refresh rate | 120Hz | 1-120Hz |
| Brightness (nits) | 1300 | 3200 |
| Processor | ||
| CPU | Octa-core (1x2.84 GHz + 3x2.42 GHz + 4x1.8 GHz) | Octa-core (2x4.32 GHz + 6x3.53 GHz) |
| GPU | Adreno 660 | Adreno 830 |
| Chipset | Qualcomm Snapdragon 888 | Qualcomm Snapdragon 8 Elite |
| Connectivity | ||
| 5G | ||
| NFC | ||
| USB | USB-C 3.2 | USB-C 3.2 |
| Wi-Fi | Wi-Fi 6 | Wi-Fi 7 |
| Bluetooth | 5.0 | 5.4 |
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This comparison is based on verified manufacturer specifications covering display, performance, camera, battery, and build quality. Scores are generated by analyzing specs across weighted categories on a 10-point scale. Learn more about our methodology.
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