Qualcomm Snapdragon 678 Advantages
Better graphics card performance FLOPS (0.3244 TFLOPS vs 0.2176 TFLOPS )
Larger memory bandwidth (14.9GB/s vs 13.9GB/s)
More modern manufacturing process (11nm vs 14nm)
Released 3 years and 7 months late
Qualcomm Snapdragon 660 Advantages
Lower TDP (5W vs 6W)