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Pump, over-under, semi-auto. Decisions. I have all three and all are 12 g. I Did have an old bolt action but got rid of it.
I personally would stay away from Yildiz o-u. They are only sold via Academy and service is less than ideal. Browning Citori for trap and skeet but heavy and kick.
Auto- Something that will handle magnum 3 1/2 " shells. Remington Versa Max is a mild kicker and handles anything. Something lighter, Beretta A400 Xcel (3").

Pump, I like the Mossbergs. For home defense I have a Maverick 88 in 18" barrel. I use #4 buck at home and double 00 buck in the field. For less than $200 it is one great gun and you can get longer barrels. I would never want to be on the receiving end of that gun with #4 buck. Mossberg makes more refined shotguns but the Maverick is no slouch.

Basically though you have to try each one to see how it fits. I think if I could only have one I would stick with the Versa Max. Never fails me and really a light kicker and will handle any task.