Concealment is different for everyone, I suppose, but as a rule a 5 shot Model 60 is far easier to hide than a 6 shot Model 64, even if they're both snub-nosed. . The new, longer barrels on M 60s do change that, however, but I'm thinking about snubbies in the true sense of that term, not small framed guns with long snouts.
Concealing a Model 64 short barrel is no different than concealing a snubbie Model 10 - NEVER as easy as hiding a J=frame.
As for value, my recently acquired/"previously owned" 4" barrel Model 64s both cost less than any of my recently acquired/previously owned stainless or alloy J-frames. A snubbie Model 64 would probably cost 100 bucks more. I still wouldn't be carrying it daily.
***GRJ***