I am unsure of 12 or 20 gauge.
The only thing I remember about a 12 is shooting my dad's pistol grip glossy jet black Mossberg. I was just a kid but, I don't remember it being as much fun as I expected it to be lol.
It was like firing a cannon at 15.
I guess what I'm getting at is if I take the shotgun out a lot, am I going to get worn out fast and sick of the mule kick coming out of a 12 gauge?
I've shot about every caliber gun but it's been many years since I was out on the range. Well over a decade.