Although my favourite ride of all time is "Back to the Future" at US, I prefer WDW beacause of the "magical" feeling I get when I'm there. I don't feel the same way at US/IOA. I guess it's the whole "WDW Package" that I like best. I'm not a Disney "nut" at home but when I'm at WDW, I feel like the rest of the world doesn't exist.