Being a big fan of ribs and having spent a lot of time at Disney World, this is a question I can totally answer! And the answer is...
There isn't one.
All the places will sometimes serve up really good ribs and sometimes serve up dried-out, hard little excuses for ribs. Even the Hoop Dee Doo has served some pathetic ribs.
But when they're good, they're pretty good everywhere. No one place sticks out as being a lot better than another.