Hmmmm - since it is only an hour, I will leave Epcot out since walking would take up most of the hour....I really only like Soarin' anyway from Future World, so wouldn't gain anything there.
I definitely want to visit during the Christmas season since I have never been there during that time, but it is one thing I plan to do 'someday'. With that in mind, I think I would want MK so I could get all the great photos of the decorations without any human obstruction and still have time to go on a ride or two.
Oh, and I would bypass the New Fantasyland. So much hype, so much fanfare, for so little. Ugh. And I still say Gaston's smells like something died in there.