Samsung Galaxy S21+ vs Xiaomi 15

The Verdict

Xiaomi 15 significantly outperforms Samsung Galaxy S21+ across nearly every dimension, despite launching years later. Display quality favors Xiaomi with 3200 nits peak brightness versus 1300 nits, LTPO technology for variable refresh rates, and sharper 2670x1200 resolution on a more compact 6.36-inch screen. Processing power shows a clear generational leap with Snapdragon 8 Elite and Adreno 830 GPU dominating the older Snapdragon 888 setup. Camera systems both shoot 8K video, but Xiaomi's 50MP main sensor with Light Fusion 900 technology and larger f/1.6 aperture captures noticeably better low-light detail than the S21+'s 12MP shooter. Battery capacity jumps from 4800mAh to 5400mAh, while charging speeds are dramatically faster at 90W wired and 50W wireless compared to 25W and 15W. Connectivity improvements include Wi-Fi 7, Bluetooth 5.4, and newer HyperOS 2 versus older Android 11. The Galaxy S21+ offers only 8GB RAM and smaller 128GB base storage, while Xiaomi starts at 12GB/256GB. Value proposition strongly favors Xiaomi at $599 versus $999, delivering flagship features at nearly 40% lower cost. Samsung's only advantage lies in brand ecosystem familiarity and established service networks outside China.