First of all let me say welcome to the board.
44 or 480?? Well get them both, life is to short to wonder if one was better than the other.
As for deer size game the 44 is more than adequate, cheaper to shoot (especially if you don't reload), has a better selection of factory ammo, and offered in many, many platforms to choose from.
The 480 picks up were the 44 leaves off with the heavier bullets. I love mine. It is neat round, kind of like a 475 Linebaugh Special(with out the custom gun price). I've taken three deer and never recovered a bullet. Large hole clean thru.
I have two 44 mags and the 480, I would not part with either. So like I say buy them both.