The Six series Rugers are, to me, analogous to K frame Smiths with weight training. Similar size, stronger.
My two PPC revolvers are built up on Six series Rugers. The second of these two revolvers is (was) a back up in the event something went out in my primary during a match. That never happened, with the result that my back up is still brand new. An unused late '70s PPC revolver is, I think, quite unusual.
I also have a 2 3/4" bbl stainless Security Six which I carried off-duty for a number of years. Again, its toughness appealed to me.
I very much like my N and L frame Smiths, but I have always preferred the Ruger Six series over the Smith K frames.
In the interests of diversity, I also have an early iteration new model stainless Blackhawk in .357 caliber. This a very handy revolver for impromptu plinking matches. It is a real tack driver, which people tend not to expect in a SA revolver, so it is a very effective sleeper - at least the first time.
I have Colts, Smiths and Rugers. They are all excellent, so from there it becomes a matter of individual preferences.