Samsung Exynos 7570 Advantages
Lower TDP (4W vs 9W)
Samsung Exynos 9820 Advantages
Better graphics card performance FLOPS (0.607 TFLOPS vs 0.0208 TFLOPS )
Larger memory bandwidth (33.4GB/s vs 4.2GB/s)
Higher Frequency (2730MHz vs 1400MHz)
More modern manufacturing process (8nm vs 14nm)
Released 2 years and 3 months late