Samsung Exynos 7904 Advantages
Lower TDP (5W vs 6W)
Released 6 months late
HiSilicon Kirin 980 Advantages
Better graphics card performance FLOPS (0.5184 TFLOPS vs 0.0493 TFLOPS )
Higher Frequency (2600MHz vs 1800MHz)
More modern manufacturing process (7nm vs 14nm)