MediaTek Helio X20 Advantages
Higher Frequency (2100MHz vs 2000MHz)
Qualcomm Snapdragon 662 Advantages
Better graphics card performance FLOPS (0.2432 TFLOPS vs 0.0998 TFLOPS )
Larger memory bandwidth (13.9GB/s vs 12.8GB/s)
More modern manufacturing process (11nm vs 20nm)
Lower TDP (4W vs 5W)
Released 4 years and 8 months late