If you have never been before, I would do 1 DCA and 1 DL and then decided how to break of the rest of your trip, based on your favorites.
Are you staying at the resort? If so and you are early risers, then I would go with the park that has early morning. When we do 5 days, we frequently will start at one park for the morning, go to DCA Redwood Creek Trail in afternoon or go to the pool and then pick the other one for the evening.
My child needs to be able to run around without having to wait in line, RCT can do for him, so we build it into our plan.