Qualcomm Snapdragon 662 Advantages
Better graphics card performance FLOPS (0.2432 TFLOPS vs 0.2176 TFLOPS )
More modern manufacturing process (11nm vs 14nm)
Lower TDP (4W vs 5W)
Released 2 years and 8 months late
Qualcomm Snapdragon 660 Advantages
Higher Frequency (2200MHz vs 2000MHz)