Which do I recommend? I highly recommend people hang out at the local library or bookstore and take a look at *all* the various guide books. Then buy the one (or 2 or 3) that best matches your style. People are different and like different things. Which bring us to...
Which do I prefer? The Passporter. It's not just that I like the Passporter for all good information, nice maps and planning functions. Or the ease of removing unnecessary pages from the non-spiral PP for easy take along. My main reason for preferring the PP is that the UG annoys me. I have issues with a book that
A) Presents the goal of WDW vacations to be getting on as many rides as possible. Everything else comes far down the list. When a book talks about a child wanting to see Mickey Mouse as an obstacle to overcome, it's lost me as a fan.
B) Leaves people with the impression that they must do what the book says or they won't have a good trip. People get so intimidated they come on this board and ask questions like, "my DS has always dreamed of spending his birthday at the MK, but his birthday falls on a Monday, and the UG says not to go to the MK on Mondays. What should I do?"
C) doesn't differentiate between the subjects it knows extremely well, and those it knows less about. Everything in the book is covered in the same, "we know exactly what we are talking about" style. Hmm, I not sure how to explain this exactly. Let me try an example.
The UG talks a lot about transportation problems getting to HDDMR. Then says MBBBQ doesn't have these problems. Huh? - they are right next to each other. Anyway, my problem isn't that I think the information is less than perfect. That's the nature of guide-book writing. What bugs me is the writing style, which presents everything as settled fact. (As perhaps a better example, read the long explanation in the UG on why their touring plans are mathematically near-perfect. Then read up on this board the experiences of many people who find that some things are actually better done differently).
But, hey, that's me. You may love the book. Check it out for yourself.