MediaTek Helio P20 Advantages
Lower TDP (5W vs 11W)
Qualcomm Snapdragon 821 Advantages
Better graphics card performance FLOPS (0.3343 TFLOPS vs 0.0576 TFLOPS )
Larger memory bandwidth (29.8GB/s vs 12.8GB/s)
Higher Frequency (2342MHz vs 2300MHz)
More modern manufacturing process (14nm vs 16nm)
Released 6 months late