MediaTek Helio G91 Advantages
Released 4 years and 2 months late
HiSilicon Kirin 985 Advantages
Better graphics card performance FLOPS (0.652 TFLOPS vs 0.096 TFLOPS )
Larger memory bandwidth (34.1GB/s vs 13.41GB/s)
Higher Frequency (2580MHz vs 2000MHz)
More modern manufacturing process (7nm vs 12nm)