I have not been to Universal so I am naturally biased towards Disney. We're still not sure of the ages and interests of your party. If your focus is roller coasters, from what I hear you may prefer Universal. We are past the big coaster stage and enjoy all the rest that is Disney.

Soarin' in Epcot is my favorite attraction. Do it at park opening or get a Fast Pass. (Or do it like me - ride first thing, get FP, ride again when FP time begins.) Plenty to do in Epcot to make it a full day. Plus Epcot has some of the best places to eat in all of WDW. As mentioned earlier, you will need to book an ADR for any table service restaurant ASAP. (They take them up to 6 months in advance.) Disney Hollywood Studios has the fewest attractions we like enough to want to repeat. Only Toy Story Mania holds a big interest for us. Unfortunately, it is truly mania to even get into line for that one. TSM is going down for 12 days of maintenance in October. But Rockin Roller Coaster and Tower of Terror are high on other people's list, just not our cup of tea. I love Animal Kingdom for the animal trails, the safari ride, the shows and the parade (daily at 3:45 pm.) They close early - 5:00 pm. For coasters: Expedition Everest is in AK plus a dinosaur themed coaster. Magic Kingdom can be a whole day park. You might want to hop on the monorail for one of your meals at a monorail resort to expand your food choices.