Samsung Exynos 1280 Advantages
More modern manufacturing process (5nm vs 8nm)
Lower TDP (6W vs 9W)
Released 3 years and 4 months late
Samsung Exynos 9820 Advantages
Better graphics card performance FLOPS (0.607 TFLOPS vs 0.487 TFLOPS )
Larger memory bandwidth (33.4GB/s vs 17GB/s)
Higher Frequency (2730MHz vs 2400MHz)