I've had cerakote, Teflon, and kg-gunkote. All of them wear at contact points and high spots. I would not waste money coating stainless. Rub it down with some Froglube if you're worried about it.
I do want a higher level of corrosion resistance, though in reality, while I hope to need it, year after year passes and I don't. But I still hope.
That being said, another reason is aesthetics. I really wanted a different look for various reasons, so Cerekote seems a good way to go as I get both in the end, whether I need it or not.
