As I said in the amod thread, xvideos because it's got the best interface on my phone and tablet. Other than screenshots, those account for 99%+ of my porn consumption these days. I can't even remember the last time watched a scene on a TV or a computer.
Maybe I'm more of a literature kind of guy, but I'm finding myself looking at gone wild stories on Reddit more than watching videos lately. They're supposedly true stories, but there's definitely a lot off fiction being peddled as nonfiction over there.