I own both, the Ruger GP100 has been back to the factory to have the hammer trigger lockup repaired. The Glock G34 has been great, like the trigger some, not as nice as the 1911s I have. G34 great starter pistol for IDPA and IPSC/USPSA. I shoot the G34 everytime I go to the range, GP100 once or twice in the last year, .357 magnum ammunition too high, but GP100 should be way cheaper than the G34. I much prefer Pistols to Revolvers, so my choice is clear, the only firearms I have had to be serviced were both revolvers, necessary repairs not custom upgrades. If you get the G34, the sights suck so I would change them asap.