Personally, I'm not a fan of UG because it seemed to be more about how to ride as many rides as possible during your visit, but not about slowing down and experiencing the parks. In fact, they scoff at anyone who likes to take it slow and not attack the parks commando style.
I'm more of a fan of Birnbaum's when it comes to "planning" because I basically just review all of the information to help remind me where everything is and what I want to be sure not to miss. For my first visit, I used it to familiarize myself with the park layouts and what rides were at each park.
To each his own, obviously...