MediaTek Helio G99 Advantages
More modern manufacturing process (6nm vs 10nm)
Lower TDP (5W vs 9W)
Released 5 years and 6 months late
Qualcomm Snapdragon 835 Advantages
Better graphics card performance FLOPS (0.5675 TFLOPS vs 0.2816 TFLOPS )
Larger memory bandwidth (29.8GB/s vs 17.1GB/s)
Higher Frequency (2450MHz vs 2200MHz)