Samsung Exynos 7880 Advantages
Lower TDP (4W vs 7W)
Released 1 years and 9 months late
Samsung Exynos 7420 Advantages
Better graphics card performance FLOPS (0.1976 TFLOPS vs 0.0912 TFLOPS )
Larger memory bandwidth (24.8GB/s vs 12.8GB/s)
Higher Frequency (2100MHz vs 1900MHz)