HiSilicon Kirin 820 Advantages
Better graphics card performance FLOPS (0.6528 TFLOPS vs 0.2432 TFLOPS )
Larger memory bandwidth (31.78GB/s vs 17GB/s)
Qualcomm Snapdragon 685 Advantages
Higher Frequency (2800MHz vs 2360MHz)
More modern manufacturing process (6nm vs 7nm)
Released 3 years late