I have owned snubs from all three, a S&W 637, a Ruger SP and a Taurus M85. Out of all three guns the Taurus was the only one i had problems with. It froze up solid at 250 rounds or so. After dealing with Taurus's customer service, I never trusted the gun again and dumped it.
The Smith and Ruger have been excellent guns. As far as CCW guns, I prefer the Smith. Better trigger, lighter weight than the SP. While the Ruger's trigger isn't nearly as good as the Smith, it does smooth out with use.
Between the two, I prefer Smith, however, if you like the Ruger better, there are no crimes in doing so.
As far as Taurus, save your money. It is possible to get a decent one but it is possible to get a terrible one. If you get a bad one, it will likely be very bad. Smith and Ruger have great customer service, Taurus, not so much.