First, if you are attempting both parks in one day...you MUST be at the parking garage by 8am. The park "opens" at 9, more like 8:30
First thing in the morning, i would do IOA. Get front seats on Hulk and DD. Must do Spiderman and Suess Landing. (Jurassic Park is so-so)
When it starts getting hot toward afternoon, go to Studios. Studios has more "inside" attractions, eliminating your standing outside in the sun/heat. You must do: Shrek, Jimmy Neutron, Mummy, MIB and Terminator. Jaws would be next as must do, as the rest of the attractions.
Have your sit-down in the a/c and then go back and finish up what you missed or your favorites.
The key to both parks in one day is: EARLY, EARLY, EARLY!!!! Commando it and put yer comfy shoes on, cuz you'll be nonstop! (Unless you are staying onsite for FOTL or buying EP)