VWL is probably geographically closest, if you take the back way out past FW and thru the backstage area, then over to Apopka-Vineland. I can look up the street names if you'd like.
I have friends who live over by Universal, and the trip seems to be quickest from VWL.
That said, I'd still recommend staying at a Universal hotel. The front of the line access is going to be crucial if you're going to see HP.