Qualcomm Snapdragon 720G Advantages
Better graphics card performance FLOPS (0.384 TFLOPS vs 0.3194 TFLOPS )
Higher Frequency (2300MHz vs 2150MHz)
More modern manufacturing process (8nm vs 14nm)
Lower TDP (5W vs 11W)
Released 4 years and 2 months late
Qualcomm Snapdragon 820 Advantages
Larger memory bandwidth (29.8GB/s vs 14.9GB/s)