Qualcomm Snapdragon 670 Advantages
Lower TDP (9W vs 10W)
Qualcomm Snapdragon 888 Advantages
Better graphics card performance FLOPS (1.72 TFLOPS vs 0.3584 TFLOPS )
Larger memory bandwidth (51.2GB/s vs 14.9GB/s)
Higher Frequency (2840MHz vs 2000MHz)
More modern manufacturing process (5nm vs 10nm)
Released 2 years and 4 months late