MediaTek Helio X20 Advantages
Better graphics card performance FLOPS (0.0998 TFLOPS vs 0.0494 TFLOPS )
MediaTek Helio P23 Advantages
Higher Frequency (2300MHz vs 2100MHz)
More modern manufacturing process (16nm vs 20nm)
Lower TDP (2.5W vs 5W)
Released 2 years and 3 months late