Don't have one but i would 1st check the blue book of gun values if you are more into collecting than shooting.
If it is the newer model smith 17 that has the aluminum alloy 10 shot cylinder, i would pass and look for an older smith with a steel cylinder---just my perference. some of the smiths in my experience are a bit "sticky" in extraction.
As for the colt, i believe that a ruger single six is much better.
You are paying more for the colt name than the gun.
I can go either way really. As said some Scouts can be quite the 'sleeper' and very collectible. Me, I'd shop the "deal".
As for the options, they are obvious and only YOU knoww3hich way you want to go if its going to be only for shooting.
All things being 'equal' I'd take the S&W.... gotta love them