I'd go for the Model 60 round butt, fixed sight, 3 inch barrel if I could find it. It would match the Model 36 I have. It just feels so nice in my right pocket. Many days when I'm feeling blue and don't know why, I slip the Model 36 in the pocket and the natural mellowing agents of cold steel settle me down and life is good.
I had a Model 60 square butt with adjustable sights and 3" barrel. That made a surprisingly good target gun to 40 yards (pop cans being the targets) but not so easy in the pocket.
The Smith is more easily repaired in that parts are more available. Within an hour of buying mine I was standing in front of a gunsmith giving me my choice of three hammers to replace the bobbed one that came with it. Try that with the Colt.
The Colt is beautiful, but if I bought one, it would probably never go into a pocket. Still I hope to buy one some day.