For my first year of wearing the badge, March 1984 to 1985, the rules said revolvers only, whether on or off the clock. I started with a 4" Model 686, 4" Model 581, 2.5" Model 66, 2" Model 60, and soon added a 4" Model 629, all S&W.
There were other periods since then when I have set aside autos totally for a year or two, the most recent being 1994 or 1995 to 1997, when I carried a 4" S&W Model 66 at work, and either the same 66 or a 4" S&W Model 19 concealed off the clock. Back-up was generally a J-snub of the Model 642 persuasion. (Not actually a 642, but a Performance Center limited edition called the M460, and that is not a typo.)
In between, I toted a 4" GP100 on and off the clock, a near-24/7 gun, from 1993 to '94 or '95. There were times in the mid-late-1980's when the Model 58 was a virtual 24/7 gun.
Since 1997, I have carried autos as "primary" on duty, unable to switch back to sixguns due to the turnaround of policy. I have often carried the same autos much of the time off the clock, for convenience. (Revolvers remain OK for back-up at work.)
Since October of 2010, I have generally toted revolvers off the clock and as back-up at work, only carrying the duty SIG P229R in the duty rig. Time will tell whether I revert to being all-revolver 24/7 after I retire, but I did recently purchase a 3.06" SP101 and a 4" S&W Model 19 with my retirement years specifically in mind.
FWIW, I am not stuck in the past. I started handgunning with a 1911, and used to think revolvers were obsolete, before I learned to appreciate them while a rookie LEO. I still like both autos and sixguns.