If you are only considering .470 to .577 then I would easily choose the 470 for the reasons mentioned (plenty of power, ammo availability, bullet weight options,...).

However, I shoot a 450/400 NE & have not found it wanting in any way. It's miserable to carry all day in the heat but can only imagine what another 2 - 3 pounds would do! Don't overlook this classic cartridge.