I've never fallen out of love with 4" barreled guns of any frame size. They are, to me, the absolute perfect balance of looks and utility.
I have guns with shorter barrels and guns with longer barrels, but given the choice I'll always pick the 4" unless I have a particular reason for picking anotehr length (concealed carry, target, because I want it just because, or dammit, I have the money, I don't need a reason!)
I spent over a decade looking for a 4" Model 25 in .45 Long Colt. I passed on several 6" Model 25s, and at least one 4" Model 25 in .45 ACP.
A few years ago I finally found it. I paid too much for it, but it was in absolutely gorgeous shape, and I wasn't going to let it slip through my fingers.
I've often opined here and other places that the 4" Model 19 S&W in .357 Magnum is the single most perfect and most useful combination of power, esthetics, portability, usability, etc., to ever be put into a single platform.
I also have 2.5" and 6" Model 19s, but I don't look at them the same way.
Right now my 4" S&W collection includes:
Model 25
Model 58
Model 19
Model 28
Model 18
My Military & Police Hand Ejector .38 Special is a 5", from the 1920s.
I THINK My M&P HE .32-20 is also a 5".
My Colt Police Positive Special .32-20 is a 4"
And I THINK my Colt Police Positive .32 New Police is a 4"... But it might be a 3".
And to be perfectly honest, I can't remember the barrel length on my .32 Long Reguation Police S&W.