MediaTek Dimensity 820 Advantages
Higher Frequency (2600MHz vs 2450MHz)
More modern manufacturing process (7nm vs 10nm)
Lower TDP (8W vs 9W)
Released 3 years and 6 months late
Qualcomm Snapdragon 835 Advantages
Better graphics card performance FLOPS (0.5675 TFLOPS vs 0.416 TFLOPS )
Larger memory bandwidth (29.8GB/s vs 17.07GB/s)