I like pretty much original content. I watch a lot of reviews and overviews and essays, all based on other folks' work, but what really interests me is watching original short films, or new comedy or drama sketches, or stuff like that.
I like almost every genre of video there is. However, it is difficult for me to actually be an active subscriber if a channel posts too often or their videos are over 6 minutes roughly. During breaks I am a lot more active on youtube, but when I am in college, I can't find the time to watch daily vlogs that are 13 minutes each.