Samsung Exynos 7420 Advantages
Higher Frequency (2100MHz vs 2000MHz)
Samsung Exynos 880 Advantages
Better graphics card performance FLOPS (0.2592 TFLOPS vs 0.1976 TFLOPS )
More modern manufacturing process (8nm vs 14nm)
Lower TDP (5W vs 7W)
Released 5 years and 1 months late