Originally Posted by Midwest Paint
I find that the people who use SS like it as it does not rust and has a nice appearance. .
That is a rider who has more concern for appearance and not for their horse's preference.
Personally, I avoid stainless altogether and only use sweet iron. I have some bits that have stainless in other parts of the bit but the mouth is sweetiron.
BTW it does not rust like a car fender does, it gets a brown patina and stays solid. I've been using one particular bit for over a dozen years with no reason to believe it wouldn't last forever.