I'm probably a bad person to answer this because most of both parks are my favorites.
In the islands,Don't miss Spiderman, it is amazing. If you like coasters you have to do Hulk and Dueling Dragons in the lost continent oh yeah....see Poseidan's Fury, we weren't going to do that one but had some time and were really really glad we did.
Jurrasic Park river adventure is very cool. Ripsaw falls and the bilge rats too. We didn't do much in Suess land so I don't know about that one.
In the Studios MIB is great. If you don't mind being knocked around a bit Back To The Future is fantastic. And even tho it sounds silly, do the Hanna Barbara Yogi bear thing, you won't be sorry. We were really unimpressed with the Nick Studios tour and that was with 2 kids that watch nick, they would rather have ridden something instead. Oh oh oh...Terminator 3d, can't forget that we must have seen it 3 times each time we went to USF. Jaws, Kongfrontation, the Hitchcock show....all great.
See I told you I'm a bad one to tell you the best.<G> Have a great time!
AG...11 days to go..I can make it...I won't think about...yeah sure.