MediaTek Dimensity 820 Advantages
Better graphics card performance FLOPS (0.416 TFLOPS vs 0.1552 TFLOPS )
Larger memory bandwidth (17.07GB/s vs 13.91GB/s)
Higher Frequency (2600MHz vs 2200MHz)
More modern manufacturing process (7nm vs 12nm)
Released 1 years and 6 months late
MediaTek Helio P90 Advantages
Lower TDP (5W vs 8W)