Samsung Exynos 7880 Advantages
Lower TDP (4W vs 9W)
Samsung Exynos 9825 Advantages
Better graphics card performance FLOPS (0.6515 TFLOPS vs 0.0912 TFLOPS )
Larger memory bandwidth (33.4GB/s vs 12.8GB/s)
Higher Frequency (2730MHz vs 1900MHz)
More modern manufacturing process (7nm vs 14nm)
Released 2 years and 7 months late