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.
“Never give in. Never give in. Never, never, never, never—in nothing, great or small, large or petty—never give in, except to convictions of honour and good sense. Never yield to force. Never yield to the apparently overwhelming might of the enemy.”