MediaTek Helio G99 Advantages
More modern manufacturing process (6nm vs 10nm)
Lower TDP (5W vs 8W)
Released 4 years and 8 months late
Apple A11 Bionic Advantages
Better graphics card performance FLOPS (0.4093 TFLOPS vs 0.2816 TFLOPS )
Larger memory bandwidth (34.1GB/s vs 17.1GB/s)
Higher Frequency (2390MHz vs 2200MHz)