Qualcomm Snapdragon 820 Advantages
Better graphics card performance FLOPS (0.3194 TFLOPS vs 0.1664 TFLOPS )
Larger memory bandwidth (29.8GB/s vs 5.3GB/s)
Qualcomm Snapdragon 630 Advantages
Higher Frequency (2200MHz vs 2150MHz)
Lower TDP (5W vs 11W)
Released 1 years and 6 months late