I prefer Disneyland over Disneyworld, it has a much nicer feel to it, it is much more charming and less corporate.
I am struggling to think of any rides that are missing from Disneyland despite its more compact size.
Universal Studios in Hollywood has actual sets and is a working studio, which is interesting.
Isle of Adventure was great in Florida though, and the Disney Water parks are fun.
I agree I-Drive is a bit nasty, where there are English pubs and fish and chip shops is usually a bad sign.
Animal Kingdom is good, but there are two great Zoo / Safaris in San Diageo.
Epcot is my favourite Disney Park in Florida.
The Sea Worlds are just about identical, except Shamu is in the water, not in a Manchester United top.