I have a few options, but I always have a .22 handgun with me every range trip. Which type depends on the day. Lately, I've been trying to fix some High Standard Magazines, so the HD Military has been out a few times.
In centerfire handguns, the 1911 platform gets more field trips than any other.
This question is almost the same as 'if you could only own one handgun, what would it be?' That is a question I would hate to have to answer.