Samsung Exynos 7420 Advantages
Better graphics card performance FLOPS (0.1976 TFLOPS vs 0.1152 TFLOPS )
More modern manufacturing process (14nm vs 16nm)
HiSilicon Kirin 955 Advantages
Higher Frequency (2500MHz vs 2100MHz)
Lower TDP (5W vs 7W)
Released 1 years late