Qualcomm Snapdragon 730G Advantages
Lower TDP (5W vs 6W)
Qualcomm Snapdragon 855 Advantages
Better graphics card performance FLOPS (0.8985 TFLOPS vs 0.4224 TFLOPS )
Larger memory bandwidth (34.13GB/s vs 14.9GB/s)
Higher Frequency (2840MHz vs 2200MHz)
More modern manufacturing process (7nm vs 8nm)