Despite carrying a 4" Model 19 on duty for several years and shooting a long barrel M-41 for Bulls eye for half a dozen years.
I would have to say that the K-22/K-38's are my favorites. Shot a 6" K-38 occasionally for bulls eye as well as PPC on my Department. The area Agencies shot a PPC competition every Wednesday morning Spring, summer and fall. I ahd a lot of fun with those comps.
Shot the 6" K-22 for bulls eye too, but mostly as a plinker and gopher gun. Taught many new shooters on that K-22 as well.
They may not have the more "modern" look of the enclosed ejector rod models.....But my favorite Smith from the 1970-80's era would be the standard old, six inch, blued K-22/K-38's.
FN in MT