Both excellent revolvers...
I don't own any colt revolvers, but there are several in my family. I am particularly fond of the Colt Diamondback .38 - a pleasure to fire and more accurate than its shooter.
However, I prefer the smooth, linear trigger action of Smith and Wesson. Purely a personal preference.
You really can't go wrong with either manufacturer here. The old Colt DA's are no longer being made, SO, plan to spend more to own/repair obviously.
Hell, I wonder if I could still get parts for my 30 year old model 19 at a reasonable price if I needed them in the future?
Shoot often, have fun
Bflobill