Straight wall.
If you might end up traveling somewhere that is shotgun only and no straight wall, then I would get a 20ga rifled slug gun. 12 ga slug guns are awful to hunt with, especially sloppy triggered pump guns. I shoot a 12ga 870 with a mossberg rifled barrel and scope. It shoots 200 yards fine and has killed a pile of bucks. But it is so bulky, heavy and unbalanced. It doesn’t handle like a rifle at all. At the range with a bench it’s fine, but real life hunting scenarios it can be a real pain.
I have killed the bulk of my deer with an in-line but I would never choose it over a rifle or a rifled slug gun.
If you might end up traveling somewhere that is shotgun only and no straight wall, then I would get a 20ga rifled slug gun. 12 ga slug guns are awful to hunt with, especially sloppy triggered pump guns. I shoot a 12ga 870 with a mossberg rifled barrel and scope. It shoots 200 yards fine and has killed a pile of bucks. But it is so bulky, heavy and unbalanced. It doesn’t handle like a rifle at all. At the range with a bench it’s fine, but real life hunting scenarios it can be a real pain.
I have killed the bulk of my deer with an in-line but I would never choose it over a rifle or a rifled slug gun.