Depends on what you want. Disney is always good because it is Disney.
We think Universal Studios and Island of Adventure are more fun. There are things at each park for kids. Island has Toon Lagoon and Suess Landing both geared to littile kids (but we still like it). Universal has Shrek, Animal Planet Live, Jimmy Neutron, Barney and WoodyWoodpecker Kidzone.
http://themeparks.universalstudios.c...a=introend&m=3
If you stay at one of the on-site hotels you can walk to CityWalk and both parks. You also get front of the line access for all rides all the time. This can be really helpful if the park is busy.
Everyone had personal prefernces. Disney is great. We just found Universal to be more fun overall.