As an armourer,
easily I'd go for the Ruger. Without even know how the internal lockworks differ, consider that with Ruger, you don't have to check to see whether the screws are tight or not. Everything interlocks on a Ruger and nothing falls off. Can't say the same about the Taurus, S&W or Colt. Shoot any of the latter for a long period and you may have to check to ensure that the screws don't work themselves loose.
Turning to the lockwork, Taurus originally started out as a copy of the S&W design. Then they cheapened it by removing the rebound slide. The rebound slide serves not only to return the trigger to its position of rest, but it also prevents the hammer from falling completely forward. It works like the hammer block but rather than blocking the nose of the hammer it blocks the seat of the hammer. Taurus replaced the rebound slide with a spring mounted pin. Sure it returns the trigger to its position of rest, but it does nothing to prevent accidental discharges.
Abuse wise the Ruger will also absorb more abuse than a Taurus. One older Ruger DA/SA revolver was attached to a rope and dragged by a pickup truck in Texas. Over the dirt, through the brush, through mud puddles and when they picked it up to test fire it, all six shot without problem. The newer GP & SP Rugers are even better.