Samsung Exynos 2100 Advantages
Better graphics card performance FLOPS (1.5304 TFLOPS vs 0.0493 TFLOPS )
Higher Frequency (2900MHz vs 1800MHz)
More modern manufacturing process (5nm vs 14nm)
Released 1 years and 10 months late
Samsung Exynos 7904 Advantages
Lower TDP (5W vs 8W)