I carry a G22 on duty, own a G30 which I carry as a backup and sleep with a G20. The 20 and 30 will never leave me, I will probably be buried with them. I shoot them all very well and never failed to shoot expert from the academy on.
While doing a PM on my gun in the academy after several thousand rounds, the armorer found a pin inside had been broken in 3 places, yet the gun never had a failure. That same gun now has around 25,000 rounds and has never had a failure. The bluing is wearing off and she is not the best looking girl at the dance but she is a great gun.
All that being said, if given the choice for what I would carry on duty, it would be a 1911. This has more to do with personal preference than any other reason.
I recently purchased a Sig 1911 Nitron that has fed everything I have given it without any complaints. It is a full size and it has become my off duty carry gun, replacing the G30. The 1911, though longer, is thinner and I think that helps a ton in concealability.
Jethro