MediaTek MT6739 Advantages
Larger memory bandwidth (6.4GB/s vs 4.2GB/s)
Higher Frequency (1500MHz vs 1400MHz)
Released 1 years and 1 months late
Samsung Exynos 7570 Advantages
Better graphics card performance FLOPS (0.0208 TFLOPS vs 0.0091 TFLOPS )
More modern manufacturing process (14nm vs 28nm)