i would have to say Kimber, and here is why, i have put atleast 7 different models of thier 1911's through there paces maybe more, and i have never had an issue with any of them. ranging from thier least expensive models, to some of thier most expensive.
however i owned a sa mc operator, i basically shot the sights loose and they were about to fall out of the dovetail during one range trip. as well i broke an extractor at the 3,500rd mark. i like 1911's but not enough to keep that one or to carry one. but if i was i would take a kimber.