Qualcomm Snapdragon 660 Advantages
Lower TDP (5W vs 15W)
MediaTek Dimensity 9400 Advantages
Better graphics card performance FLOPS (4.9521 TFLOPS vs 0.2176 TFLOPS )
Larger memory bandwidth (85.3GB/s vs 13.9GB/s)
Higher Frequency (3630MHz vs 2200MHz)
More modern manufacturing process (3nm vs 14nm)
Released 7 years and 5 months late