Qualcomm Snapdragon 662 Advantages
Lower TDP (4W vs 5W)
Released 9 months late
Qualcomm Snapdragon 730G Advantages
Better graphics card performance FLOPS (0.4224 TFLOPS vs 0.2432 TFLOPS )
Larger memory bandwidth (14.9GB/s vs 13.9GB/s)
Higher Frequency (2200MHz vs 2000MHz)
More modern manufacturing process (8nm vs 11nm)