small - warbonnet edge. I figure I can pitch low and tight in really nasty weather and even a small tarp will keep me dry enough to not get into trouble (although I won't be as comfortable as I could be, that's been proven
My reason is weight. I like to keep things as light as possible so that I can go farther and see more all while being more comfy than I was back in the day of heavy packs and leather boots!!!