For hunting or even animal defense.....4 should be more than enough! If hunting requires more than four....you need more practice. If in defense against animal attack....it’s very unlikely that you’ll get off more than one or two! JMO
So, go with which ever cartridge you prefer. If you’re regulated to factory stuff, the .454 is more versatile. If you’re a hand loader, you can make the .475 pretty darn versatile! memtb