Get both! Getting serious though, both are fine guns, and I'd say it depends on what you want to do with it. For concealability, get the 1911. And for a target gun, the 1911 will have a better trigger. I've got a Kimber Gold match and a Colt 1991A1 that I'm slowly customizing. Both are great guns, but considering the initial cash outlay on the colt was half that of the kimber, I hate to say it but the benefits of the kimber are marginal. Even after an arched MSH and a Kings beavertail, the colt is still 400 bucks under the cost of the kimber, every bit as reliable and I can't shoot any better off a bench rest with the kimber either. The basic Kimber/Springfield loaded will cost much less than the Gold match and that won't be as big of an issue.
I've also got the HK45 USP. The HK has a coolness factor, and it's also been reliable, but I've never had a reliability problem with any of them. It's very accurate for a combat gun, even given it's marginal trigger. It's far easier to clean, and makes a great home or car defense weapon. I also carry it hiking, fishing and camping. If the idea of carrying cocked and locked gives you the heebie-geebies then it can be carried decocked with the safety on or off. Both types of gun can be carried cocked and locked safely, the HK gives you the choice of either mode. A bonus of the HK is that it's just under a pound lighter than the 1911, but percieved recoil is about the same. It's got a bif fat grip that helps in that area as well, but it's thickness makes concealment more challenging, and if you don't have gorilla hands like I do, then the 1911 may be a better choice.
I'd handle both and feel the trigger on both and go from there.
On a final note, I thought it was interesting that I had to shorten my reloads by about a fifteen thousandths of an inch because the bullet was jamming into the rifleing on the HK, which could cause pressure problems. They had worked fine in the 1911's. If you reload, make sure that the bullets cycle smoothly in the gun before you shoot them. If you shoot factory loads, it won't ever be a problem.