Better Features and Updates in Compare to M51 Build Quality of phone it doesn't look cheap as M51 Better Processing Power in compare 730G chipsets. Knox Security through Hardware and Software Front Samsung Pass, Secure Folder and Etc support. Bixby and Bixby Routines support. Gooooodlock Support. Better Network Connections. Full One UI support
cons of A71 is low battery like 4000mah only in compare m51.