On the assumption that “favorite” means a shotgun that I own, as opposed to one that I’d like to own; I’d say the SKB 100 side by side. It was a very nice bird Gun when I bought it. Now it’s cut down and slicked up for cowboy shooting.
I really liked my Remington 1100 but just sold it this weekend. Reason being that I just bought a Remington 11-87 left hand premier. I'm not a lefty but have poor vision in my right eye which has me shooting left handed. I think it will be my favorite now.