Most anything that fits in the box will work. Go with whatever you're most comfortable with, not just shooting but mag changes, drawing from the holster, etc.
I use 1911s because I carry a 1911 every day.
"If violent crime is to be curbed, it is only the intended victim who can do it. The felon does not fear the police, and he fears neither judge or jury. Therefore what he must be taught to fear is his victim." - LtCol Jeff Cooper