MediaTek Helio P20 Advantages
More modern manufacturing process (16nm vs 28nm)
Lower TDP (5W vs 6W)
Released 2 years late
Qualcomm Snapdragon 801 Advantages
Better graphics card performance FLOPS (0.148 TFLOPS vs 0.0576 TFLOPS )
Larger memory bandwidth (14.9GB/s vs 12.8GB/s)
Higher Frequency (2500MHz vs 2300MHz)