Qualcomm Snapdragon 680 Advantages
Larger memory bandwidth (17GB/s vs 14.9GB/s)
Higher Frequency (2400MHz vs 2300MHz)
More modern manufacturing process (6nm vs 8nm)
Released 1 years and 9 months late
Qualcomm Snapdragon 720G Advantages
Better graphics card performance FLOPS (0.384 TFLOPS vs 0.284 TFLOPS )