I've got a Glock 21 45ACP, and a Ruger Blackhawk convertible 45 Colt/45ACP.
I don't think you can really go wrong either way choosing auto or revolver.
If you like to save your brass, one nice thing about a revolver for a field gun, it doesn't fling your empties way over there in the grass/vegetation, or hot brass into the snow.
