DisneyWorld is comprised of 4 Theme Parks: Magic Kingdom, Epcot, Hollywood Studios, and Animal Kingdom. Saying "Disney World" on its own would be more appropriate for something like "Top 10 Best Resorts" as it is a resort comprised of 4 Theme Parks, 2 Water Parks, and about a score of hotels. In essence, which park in DisneyWorld?
Epcot is truly something different, like a science-museum with rides as well as brilliantly accurate pavilions of some of the worlds most cultural nations, and their firework shows one of the best. There is no other park like it, it's one of a kind and it leaves you both exhilarated and educated.