If you like bigger coasters and water rides then IOA,Universal has more of a balance of rides and shows and a very good indoor coaster in the Mummy,and a good dark shooting ride in Men in Black,they also are opening in the next few weeks the new Simpson's ride.I don't know when you're going but over in IOA they're building the new Harry Potter area that won't be ready until like 2010 and they might be closing part of the Lost Continent area where their Dueling Dragons coaster is at.I would suggest unless you're a big coaster enthusiast and want to do the water rides to do the Universal park for now with a new ride in the Simpson's and as I said also check if you decide to got to IOA that Lost Continent isn't closed for Potter construction.The Universal park is also getting another coaster called Hollywood,Rip,Ride rocket but that will be in 2009.