Define "favorite"? My S&W rimfires include a 48-0, a Pre-17 K22, a 17-2, a 617-1 and a 43-0.
I love them all, but....
Most classic - Pre-17 K22, followed by the 17-2.
Most unique - 48-0, a one-year production model. This one was badly neglected, abused and cosmetically destroyed by a previous...