MediaTek Dimensity 930 Advantages
Larger memory bandwidth (51.2GB/s vs 29.8GB/s)
More modern manufacturing process (6nm vs 14nm)
Lower TDP (4W vs 11W)
Released 5 years and 9 months late
Qualcomm Snapdragon 821 Advantages
Better graphics card performance FLOPS (0.3343 TFLOPS vs 0.2592 TFLOPS )
Higher Frequency (2342MHz vs 2200MHz)