Qualcomm Snapdragon 685 Advantages
Higher Frequency (2800MHz vs 2450MHz)
More modern manufacturing process (6nm vs 10nm)
Released 6 years and 4 months late
Qualcomm Snapdragon 835 Advantages
Better graphics card performance FLOPS (0.5675 TFLOPS vs 0.2432 TFLOPS )
Larger memory bandwidth (29.8GB/s vs 17GB/s)