Samsung Exynos 7870 Advantages
Lower TDP (3W vs 5W)
Samsung Exynos 880 Advantages
Better graphics card performance FLOPS (0.2592 TFLOPS vs 0.0224 TFLOPS )
Higher Frequency (2000MHz vs 1600MHz)
More modern manufacturing process (8nm vs 14nm)
Released 4 years and 3 months late