I voted KH of course after all I am a mod and wouldn't be of much help here if I spent too much time on Rav.
However, in reading the posts I think maybe the poll could have been more specific. Maybe not so much where you spend your time, but where do you most participate. I spend a lot of time Ravelry, but the majority of it is browsing patterns, yarns, etc. While I have posted in a few forums there 99% of my participation is here. This feels like home to me and Rav is a place I visit.