Qualcomm Snapdragon 626 Advantages
Better graphics card performance FLOPS (0.1248 TFLOPS vs 0.0998 TFLOPS )
Higher Frequency (2200MHz vs 2100MHz)
More modern manufacturing process (14nm vs 20nm)
Released 1 years and 5 months late
MediaTek Helio X20 Advantages
Larger memory bandwidth (12.8GB/s vs 7.5GB/s)
Lower TDP (5W vs 11W)