Samsung Exynos 850 Advantages
More modern manufacturing process (8nm vs 16nm)
Lower TDP (3W vs 5W)
Released 4 years and 1 months late
HiSilicon Kirin 955 Advantages
Better graphics card performance FLOPS (0.1152 TFLOPS vs 0.0394 TFLOPS )
Higher Frequency (2500MHz vs 2000MHz)