Qualcomm Snapdragon 870 Advantages
Higher Frequency (3200MHz vs 2840MHz)
Lower TDP (6W vs 10W)
Qualcomm Snapdragon 888 Advantages
Better graphics card performance FLOPS (1.72 TFLOPS vs 1.3721 TFLOPS )
Larger memory bandwidth (51.2GB/s vs 44GB/s)
More modern manufacturing process (5nm vs 7nm)