MediaTek Helio X30 Advantages
Larger memory bandwidth (27.81GB/s vs 13.9GB/s)
Higher Frequency (2600MHz vs 2000MHz)
More modern manufacturing process (10nm vs 11nm)
Qualcomm Snapdragon 662 Advantages
Better graphics card performance FLOPS (0.2432 TFLOPS vs 0.2176 TFLOPS )
Lower TDP (4W vs 5W)
Released 2 years and 11 months late