At all star movies, preferred guarantees you the fantasia buildings. They are supposedly the closest to the lobby, foodcourt, gift shop. They are also supposedly the most popular buildings. We just got back from there, ASMovies, the Toy Story Buzz Lightyear building. It was just as close as the fantasia buildings. The 101 dalmations building also is close. When we checked in they were going to give us the Herbie building - the farthest away - and we asked for Toy or 101 and they were able to get us in there after some work.
If you want a guarantee of what building, go with preferred rooms. If not just book standard. Also, this saved us a few more bucks over stay, pref vs. standard.