HiSilicon Kirin 710A Advantages
Lower TDP (5W vs 6W)
Released 8 months late
HiSilicon Kirin 990 4G Advantages
Better graphics card performance FLOPS (0.6912 TFLOPS vs 0.128 TFLOPS )
Higher Frequency (2860MHz vs 2000MHz)
More modern manufacturing process (7nm vs 14nm)