Favorite?
This question took a bit of thought.... I have a fair number of S&W revolvers (the autos don't come to mind when I'm asked this sort of question anyway) and all have their good points.
I guess my favorite would have to be the one I most often carry... which is an M28 4". I realize the K frame is lighter to carry (and at times I do carry a M66 2.5" or a M60/357...mostly when feeling lazy) The M28 with it's heavy frame seems easier to shoot accurately for me at least, than the smaller guns. The M28 to me seems to be mechanically the same as my M27s, but with a more durable finish.
Honorable mention woul go to the M624 4" I carry from time to time when the urge strikes me....
FWIW
Chuck