That's a tough decision. I'm a Knight fan and was planning to get the Mountaineer but found a stainless (not weather shield)Pro Hunter on clearance for about $100 less than a Mountaineer and couldn't help myself. So far I'm really happy with with my choice. I don't think either would be bad though.
There's still a few ss Pro Hunters around here for sale for about the same as a Mountaineer.
The Mountaineer will be more accurate from a bench but I don't think significantly so and I doubt you would notice any difference in a hunting situation.