I think it's really a tie for me. Handguns and rifles. I went with handguns, since that's really was my first focus and, these days, what I have done the most work with.
But I still love rifles. Like Sevens, I was a 4H 3P kid, back in the day and the discipline and focus of rifle shooting remains something close to my heart.
For the most part I shoot my pistols or dink around with whatever battle rifle for funsies, but when I want some Zen time, I get out my SKS, which is the closest thing around here for getting what I love out of rifle shooting.
In fact, I still kind of roll my eyes about the fact that my Dad, in a very typical clueless male fashion, bought me a plastic 10/22 for my 18th birthday. A single shot, heavy bolt would have been much more in line with what I like.