It depends entirely on my mood, I won't lie. Sometimes I'm REALLY into amateur stuff, usually fucking. I love seeing a bottom who really, really, enjoys it. A few years ago, I came (hah!) across a compilation of bottoms who came too soon or unexpectedly. Those are my favorites.
Haven't been able to find the video for a long while, though.
I also really like the ones where a guy is fingered, and only fingered. Seeing them go crazy makes me wish I was there doing it for them.
Other than that? Mostly straight porn or some solo stuff.