MediaTek Helio G25 Advantages
Larger memory bandwidth (13.9GB/s vs 12.8GB/s)
More modern manufacturing process (12nm vs 16nm)
Lower TDP (2W vs 5W)
Released 4 years and 4 months late
MediaTek Helio P20 Advantages
Better graphics card performance FLOPS (0.0576 TFLOPS vs 0.0418 TFLOPS )
Higher Frequency (2300MHz vs 2000MHz)