Qualcomm Snapdragon 632 Advantages
Lower TDP (5W vs 6W)
Qualcomm Snapdragon 678 Advantages
Better graphics card performance FLOPS (0.3244 TFLOPS vs 0.1248 TFLOPS )
Higher Frequency (2200MHz vs 1800MHz)
More modern manufacturing process (11nm vs 14nm)
Released 2 years and 6 months late