Qualcomm Snapdragon 820 Advantages
Better graphics card performance FLOPS (0.3194 TFLOPS vs 0.0576 TFLOPS )
Larger memory bandwidth (29.8GB/s vs 12.8GB/s)
More modern manufacturing process (14nm vs 16nm)
MediaTek Helio P20 Advantages
Higher Frequency (2300MHz vs 2150MHz)
Lower TDP (5W vs 11W)