I had 3 different square butt 629-4 guns. A 4”, 6”, and an 8 3/8” model. All three were excellent shooters. My old hands will just not stand the recoil anymore. My 1911 45’s will be next. It sucks to get old.The only 629 I would buy at this stage of the game is a square-butt 629-4. There doesn't seem to be a lot of those out in circulation, but they’re out there, and they combined the desirable features that I happen to prefer. 629-3s are more practical for me since they handle the same size bullets that my older 29s use.
As a general rule, I have no use for short-barrel and/or round-butt N-frames.
They are all good guns if they are treated correctly.