Samsung Exynos 7884B Advantages
More modern manufacturing process (14nm vs 16nm)
Released 3 years and 7 months late
MediaTek Helio P20 Advantages
Better graphics card performance FLOPS (0.0576 TFLOPS vs 0.0493 TFLOPS )
Larger memory bandwidth (12.8GB/s vs 7.8GB/s)
Higher Frequency (2300MHz vs 1560MHz)