Do not buy the Colt, buy a revolver that is backed up by a company that can repair its products and will be able to do so in the future. That means a Ruger or a Smith.
Since you specified the S&W models 64 or 67 let me say that either gun is excellent, the major difference being the adjustable sights on the 67. My experience with many K frames is that the fixed sights work very well with 158 grain ammo.
While it is very common to read that new Smiths are trash, don't compare to the good old days, etc. etc., my experience with five post 2000 Smiths, 4 with the dreaded lock, is that they are well built, finished, reliable and accurate. There is nothing wrong with MIM parts except the aesthetics and while I don't like the lock, mostly because of the looks, they have never failed in thousands of rounds. I also have approximately 30 non-MIM, non lock Smiths dating back to 1918, some may be prettier, but it isn't night and day like some would claim.
Yes I have some Colts, an OP from 1943 and a PPS from 1962. The workmanship is nice, but they are not the shooting gun that a Smith is, I'm a DA shooter and Colts suck in this department. That's my MHO. That only Colts I'll recommend are the NRM 1911 and the various AR-15 variants. Bet some of you boys still drive Model Ts cause they don't make tham like they used to.