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870 or 835. It really makes no difference to the bird, both will pattern and both go bang when you pull the trigger. Handle both and purchase the one you like best. Your goal can be accomplish with either.
I'd go Mossy. They are already drilled and tapped and a few bucks cheaper. The money save on the gun could be put toward ammo. The ammo makes the gun not the other way around. My cheap 935 with good ammo will embarrass guns costing 3x as much.
To me the 835 ulti-mag is THE turkey gun, you gotta have one.