If you only went to one park which one is better between universal and island of adventure? I think spongebob is at universal correct? Are these parks within walking distance of each other?
The parks are right beside each other, so easily walkable. Sponge Bob is in Universal. The two parks are very different. IOA is a bit more adventurous and has more coasters and water rides. Universal has more tame things but also has a few thrill rides.
And just remember when switching parks - DON'T cross the bridge to CityWalk. As soon as you exit the park (either one) look for the Hard Rock Cafe, walk towards it, then keep on walking. You'll hit the other entrance in a minute or two.