MediaTek Helio G91 Advantages
Released 5 years and 8 months late
Qualcomm Snapdragon 675 Advantages
Better graphics card performance FLOPS (0.3244 TFLOPS vs 0.096 TFLOPS )
Larger memory bandwidth (14.9GB/s vs 13.41GB/s)
More modern manufacturing process (11nm vs 12nm)