MediaTek Dimensity 820 Advantages
Better graphics card performance FLOPS (0.416 TFLOPS vs 0.3343 TFLOPS )
Higher Frequency (2600MHz vs 2342MHz)
More modern manufacturing process (7nm vs 14nm)
Lower TDP (8W vs 11W)
Released 3 years and 9 months late
Qualcomm Snapdragon 821 Advantages
Larger memory bandwidth (29.8GB/s vs 17.07GB/s)