Qualcomm Snapdragon 439 Advantages
More modern manufacturing process (12nm vs 16nm)
Released 2 years and 4 months late
MediaTek Helio P20 Advantages
Better graphics card performance FLOPS (0.0576 TFLOPS vs 0.0432 TFLOPS )
Larger memory bandwidth (12.8GB/s vs 6.4GB/s)
Higher Frequency (2300MHz vs 2000MHz)