Qualcomm Snapdragon 855 Advantages
Lower TDP (6W vs 8W)
Qualcomm Snapdragon 888 Plus Advantages
Better graphics card performance FLOPS (1.8534 TFLOPS vs 0.8985 TFLOPS )
Larger memory bandwidth (51.2GB/s vs 34.13GB/s)
Higher Frequency (2995MHz vs 2840MHz)
More modern manufacturing process (5nm vs 7nm)
Released 2 years and 6 months late