Samsung Exynos 2100 Advantages
Better graphics card performance FLOPS (1.5304 TFLOPS vs 0.1976 TFLOPS )
Larger memory bandwidth (51.2GB/s vs 24.8GB/s)
Higher Frequency (2900MHz vs 2100MHz)
More modern manufacturing process (5nm vs 14nm)
Released 5 years and 8 months late
Samsung Exynos 7420 Advantages
Lower TDP (7W vs 8W)