Qualcomm Snapdragon 820 Advantages
Larger memory bandwidth (29.8GB/s vs 28.7GB/s)
Samsung Exynos 9810 Advantages
Better graphics card performance FLOPS (0.3706 TFLOPS vs 0.3194 TFLOPS )
Higher Frequency (2900MHz vs 2150MHz)
More modern manufacturing process (10nm vs 14nm)
Lower TDP (5W vs 11W)
Released 2 years and 2 months late