A difference of opionion here. We really liked Aquatica. We went at the end of August last year, after the Americans had gone back to school. Earlier in the year, it was closed by 11.00 in peeps as it was full. We also paid for the cookout, which DH liked, although I wasn't too keen on it.
There wasn't as much shade and plants, unlike Disney. But there were some good rides and my DS liked the kids water park, where buckets fill with water and then tip over.
We would have gone again, and we loved the fast flowing lazy river thing where you put the life vests on. I couldn't get out and just kept wizzing by.
Of the 2 Disney ones, we like Typoon Lagoon the best.