Favorite that I've shot?
My Father-in-law's old H&R 949 was an awesome .22 revolver. If he ever wants to part with it I'd buy it in a heartbeat.
My favorite that I own is my Magnum Research Baby Eagle in .45 ACP. This is just an underrated gem of a handgun. I'd put it against SIG for reliability any day and it is definitely more accurate than I am.
That said, I have a long standing appreciation for SIGs and HKs. I'd love to own a 226 or an HK 45 someday. Those would be my favorites that I've never owned or fired.