We are only spending 1 day at Universal area and we are going to get the 1 day/2park ticket. I think that they sell it at the gate only for around $70. It's only about $10 more than a one park ticket. We probably won't go on many rides at IOA but my mom wanted to walk around and see everything there since she's never been! I'm hoping to get her to go on a few rides!
Both parks are so different it is hard to choose. I love the fun of IOA Suess Landing is so much fun for the little ones and if you like rides Spiderman and the Hulk are the best rides Universal has to offer.
If you are interested in Movies Universal Studios is cool because they have Jaws ride, Mummy ride, Beetle Juice review there is just so much in both parks. I am not even going to the WDW parks this year. Just Universal with my front of the line access. It can't be beat.