I agree, both are invaluable. IMHO the Unofficial is more detailed and comprehensive, their recommended ride itineries are excellent.
However, the Passporter made the trip with us. It's much smaller and easier to tote with you. I enjoyed the folders for preplanning. They also offer updates from year to year on their site.
As another recommendation, on the All-Ears site, they have information on ordering a 3rd book, Aronda Park (sp?). There is a large & a small book available plus bonus DVD/CD. I enjoyed reading both books. The smaller one is similar to the Passporter with envelopes, but it is slightly larger than a deck of cards and it fit nicely into the fanny pack I wore into the parks.