Price difference should be about $70 on new guns, but that really all depends. It can be $50 or $150 depending on your dealer and what you find. The model 64 with firing pin on hammer is much to be preferred (IMHO) over newer Smiths and the Ruger for any purposed except concealed carry. Even then, I would pick the Smith, but difference in size means little to me. It may make all the difference in the world to you. The Ruger is maybe 3 or 4oz lighter, and may outlast the S&W. Again I could care less, but it may be of consequence to you. I can’t get used to the cylinder release and ejector rod of the Ruger, but if you have no strong preference then you will have no problem. The S&W trigger is it’s only tangible advantage, but I like the way the gun feels (between the two) and that is enough.
Out of curiosity, why no 357? You reduce your resale value and limit yourself without benefit. I will not try to change your mind, but am interested to understand. You also eliminate some fine guns like the S&W 65 Ladysmith, my second favorite K frame. I’d have a brace of them if it weren’t for objections to the name.
David