Qualcomm Snapdragon 690 Advantages
Better graphics card performance FLOPS (0.4864 TFLOPS vs 0.0998 TFLOPS )
Larger memory bandwidth (14.9GB/s vs 12.8GB/s)
More modern manufacturing process (8nm vs 20nm)
Released 5 years and 1 months late
MediaTek Helio X20 Advantages
Higher Frequency (2100MHz vs 2000MHz)
Lower TDP (5W vs 6W)