Dang, they got hillbillies in Michigan? Who'd a thunk it? ROFL!
Screw that idiot, get the 20 gauge. He's a moron, obviously. Stack barrel or SxS, well, I've got two SxSs, but I wanna add a stack barrel. I can't really compare the two, but I do like double triggers. I'll take a selectable single trigger. But, I don't want a non-selective single trigger. That's about all the input I can give ya. Most of your better stack barrels have a selective single trigger and will have selective ejectors. Most of the affordable SxSs will have double triggers. I don't know why it's so hard to get selective ejectors on cheaper SxSs, but I'd really prefer them. Extractors are simple, though, and I do like to police my brass, don't leave it in the field.
As to how they shoot and swing, I've never hunted with an OU, but the one's I've picked up and swung and shot on the range that belonged to friends seemed more forward weight bias than I'm used to with a SxS. Why, I don't know, just seemed to swing and balance more like a repeater, not as quick, but smoother swing and easier follow through. But, I'm a guy that used to hunt ducks with a 6.5 lb 12 gauge SxS, so whadda I know? LOL