Hi Beth,
I don't dislike them I guess I am viewing things through Joshua's eyes (as normal!), I just think from what I have seen of Aquatica there is more for kid's there.
You even look at the 'happy harbor' area of Sea World and that in my opinion is better too.
If you put the kind of water attractions for children that they have at Aquatica at say Typoon Lagoon it wouldn't fit in with the theming in place so I am not being totally naive.
However, I think they could do more.
From what I have seen Deb, for the ages of your children I would give Aquatica a try first, it depends on what type of tickets you are buying from the parks. I agree with Libby though and obviously if you have Disney tickets you may have water park one's too so I think the opportunity is there to try them all.
I can highly recommend 'happy harbor' at Sea World, I think it's really good for kid's.
http://www.shamushappyharbor.com/
Getting there early is a good tip as at peak times of the year they get packed, I would definitely avoid at weekends when they are extremely busy , though this doesn't apply necessarily to Sea World.