These three are Qualcomm Snapdragon flagship level processors, but 835 and 845 is TSMC's ten nanometer architecture process, and 855 uses TSMC's seven nanometer architecture process, the latter's performance is much stronger than the first two, the latter also supports uf3.1 flash memory and lddr5 memory, support 100 million pixel high-definition camera, This is not supported by the previous two processors.