Samsung Exynos 7420 Advantages
Larger memory bandwidth (24.8GB/s vs 17.1GB/s)
MediaTek Helio G99 Advantages
Better graphics card performance FLOPS (0.2816 TFLOPS vs 0.1976 TFLOPS )
Higher Frequency (2200MHz vs 2100MHz)
More modern manufacturing process (6nm vs 14nm)
Lower TDP (5W vs 7W)
Released 7 years and 1 months late