My favorite is a s&w model 18-4. A close 2nd is a couple ruger mkIIs', a 5.5 target and a 4-3/4" standard of which I prefer the standard.
3 different bbl lengthed single-sixes follow that...
I own and enjoy a couple hi-standards in longhorn revolver guise and a 6" sentinel, 3 more s&ws' as in 2" 34 square, 6" 617 square, and a model 17 which is on par with the 18 but I prefer the 4"...
Also enjoyed is the 1st rimfire handgun I fired in Colt's peacemaker 6"....I have a n.o.s. 7" buntline bbl that will someday maybe make it on for sentimental reasons of my father and uncle who each had one....
Also owned and enjoyed is my 1st new purchase of a rimfire pistol is a 5.5" flat sided heavy bbl browning buckmark....I will be selling off all but probably my 3 favorite and practical use since my interests' and time spent with all of these has changed in the last few years....somebody will certainly enjoy them as I have...cheers!