It just depends on what you want ...the style and weight, etc..
I like a 12ga / in any platform semi-auto, pump and Over Under ( I'm not a SXS guy like my buddy OneOunce ..)
But I also have and like 20, 28ga and .410's -- all made on 20ga frames. It just depends on what I want to do / sporting clays, some Skeet, Trap or some field hunting... Its a nice problem to have ...wondering which gun and which gague I'll take out to the club tomorrow ...
Good luck and have fun in your search for the perfect gun. ( I fall in love with too many / too many of them seem to follow me home )