Qualcomm Snapdragon 820 Advantages
Larger memory bandwidth (29.8GB/s vs 18.4GB/s)
MediaTek Dimensity 900 Advantages
Better graphics card performance FLOPS (0.621 TFLOPS vs 0.3194 TFLOPS )
Higher Frequency (2400MHz vs 2150MHz)
More modern manufacturing process (6nm vs 14nm)
Lower TDP (4W vs 11W)
Released 5 years and 6 months late