Samsung Exynos 7884B Advantages
Lower TDP (5W vs 9W)
Released 10 months late
Samsung Exynos 9820 Advantages
Better graphics card performance FLOPS (0.607 TFLOPS vs 0.0493 TFLOPS )
Larger memory bandwidth (33.4GB/s vs 7.8GB/s)
Higher Frequency (2730MHz vs 1560MHz)
More modern manufacturing process (8nm vs 14nm)