Most of my revolvers are Ruger, followed by S&W. I don't own any Colts yet.
I like Ruger because they are rugged, well made guns that are easily modified and inexpensive. S&W makes an better quality gun out of the box, though at a higher price. Always wanted a Colt. Waiting for the right opportunity to come along.
Personally I love every smith and Wesson I have ever shot. That being said. I completely understand why ruger guys love their rugers so much. They are rugged and pure function. If I knew I was going to put a serious beating on a gun and not worry about it, I would go with a ruger. I like the style and character of smiths.
(I still drool on vaqueros every time I am at the gun shop, but we are talking double action here)