As everyone else has said. Totemist is the ideal class in MoI for reaching out and touching someone (with a small arsenal of natural attacks). Totemist has the better BAB progression as well, which is obviously important when mauling.

That said, at higher levels, keep in mind that the name of the game is less "damage per swing" and more "so, can you fly?" The Incarnate, in the long run, will give you more versatility (as others have mentioned); an assortment of abilities that can benefit you and your party.

Note also that when it comes to MoI PrCs (particularly the Ironsoul Forgemaster, handbook in my sig) the Incarnate may be a better chassis. Not because of its BAB, but because it gets a (slightly) better essentia progression, of which you'll want to take advantage.