I agree that the 12 ga. can do just about anything in the hands of a knowlegeable, experienced shooter....

I still LOVE my American Arms s/s 3 1/2" magnum 10 ga.
It's heavy
It's UGLY
and it's killed a pile of gobblers over the years....I've never lost a bird with it (knock on wood)-although I've gotten into some wicked footraces & wrestling matches after the shot!
You should see the flame from this thing early in the murky AM![:@]

My vote is for the 10 gauge