MediaTek Dimensity 800 Advantages
More modern manufacturing process (7nm vs 10nm)
Lower TDP (8W vs 9W)
Released 2 years late
Qualcomm Snapdragon 845 Advantages
Better graphics card performance FLOPS (0.727 TFLOPS vs 0.3328 TFLOPS )
Larger memory bandwidth (29.8GB/s vs 17.07GB/s)
Higher Frequency (2800MHz vs 2000MHz)