Samsung Exynos 7870 Advantages
Lower TDP (3W vs 5W)
MediaTek Helio G90 Advantages
Better graphics card performance FLOPS (0.2074 TFLOPS vs 0.0224 TFLOPS )
Higher Frequency (2050MHz vs 1600MHz)
More modern manufacturing process (12nm vs 14nm)
Released 3 years and 5 months late