Too many variables enter in to give a one size fits all answer. My best squirrel shotgun had a full choke to reach out and touch the fuzzytails with a compact pattern. A good rabbit gun will probably have a modified choke to give the proper closer pattern for bush bunnies. Clay and Skeet shooters will require a different choke on each of their double tubed guns for different distances. My Double Barrel Coach S x S Shotgun is both open choke to spread quickly in a Home Defense setting. A slug gun will probably have an "improved cylinder" choke. Maybe "What choke do you use for what purpose?" may be a better question, and as you can see, that is still hard to answer.
The pattern any shotgun throws can be influenced and improved somewhat by how the shell is made. Does it have a shot cup to keep the charge tight from shell to muzzle? Does it have a "buffered" substance between the pellets to prevent deforming? Like I say, a LOT of variables.
The best thing you could probably do is take a package of paper plates with you and try to pattern each shotgun at a plate before you buy, then purchase the one with your "best" pattern from that.
One alternative would be to get a shotgun that has a "screw in choke" feature. That way, with a few different choke inserts, you could have the best of all the worlds.
