Since there are only 3 coasters I would have a look at the website for each park and see what attracts the 4 of you most. Take away the coasters at IOA and you are still left with plenty to do. May is a beautiful month so you can enjoy all the water rides and attractions too. If you wont be there during a very busy time you might want to consider splitting the day between both parks. They sell a one day 2 park pass at the gate.
On the other hand you may want to see one park only so you can take it slower and enjoy shows as well as rides.
The highlights at IOA would be spiderman, hulk (coaster), Jurassic Park River Adventure, Dudley Ripsaw Falls, Popeyes Bilge Rat Barges, Dr. Doom, Cat in The Hat, Dueling Dragons (coaster) There is more theme detail at IOA but Universal Studios has its charms as well.
At UNiversal the highlights would be Mummy, Shrek, Jimmy Neutron's Blast, Jaws, Men in Black, Make Up Horror Show(lots of fun) Terminator 2 (3-D adventure) Back to the future (I would miss this...LOL) makes me ill.
Its a tough call and one that only the 4 of you can make since you know what you like better than we do but this should give you a taste of whats there.
Will the other 3 do the coasters? I think me personally I would do Universal this time out since you have The Mummy that is new and MIB which is a blast, you could have fun with 2 couples riding together or against each other! Shrek is pretty new also and its great. No water rides though so consider that too.
Have a look at
www.universalorlando.com and compare the parks. Either way you will have a great time!
