MediaTek Helio P90 Advantages
Lower TDP (5W vs 6W)
Qualcomm Snapdragon 678 Advantages
Better graphics card performance FLOPS (0.3244 TFLOPS vs 0.1552 TFLOPS )
Larger memory bandwidth (14.9GB/s vs 13.91GB/s)
More modern manufacturing process (11nm vs 12nm)
Released 2 years and 1 months late