MediaTek Helio G99 Advantages
More modern manufacturing process (6nm vs 7nm)
Lower TDP (5W vs 6W)
Released 3 years and 8 months late
Apple A12 Bionic Advantages
Better graphics card performance FLOPS (0.576 TFLOPS vs 0.2816 TFLOPS )
Larger memory bandwidth (34.1GB/s vs 17.1GB/s)
Higher Frequency (2490MHz vs 2200MHz)