Apple A9 Advantages
Lower TDP (5W vs 9W)
Samsung Exynos 980 Advantages
Better graphics card performance FLOPS (0.2621 TFLOPS vs 0.2496 TFLOPS )
Larger memory bandwidth (34.1GB/s vs 14.9GB/s)
Higher Frequency (2200MHz vs 1850MHz)
More modern manufacturing process (8nm vs 14nm)
Released 4 years late