Qualcomm Snapdragon 810 Advantages
Larger memory bandwidth (25.6GB/s vs 14.9GB/s)
Qualcomm Snapdragon 675 Advantages
Better graphics card performance FLOPS (0.3244 TFLOPS vs 0.3072 TFLOPS )
More modern manufacturing process (11nm vs 20nm)
Released 4 years and 6 months late