I think the 2 best guides are the Unoffical Guide and Passporter. Having been to WDW many times, and having (I think) my comando days behind me, I now prefer Passporter. It has good, up-to-date, information, and probably one of the best restaurant sections. Information is easy to find and the maps easy to sue. While at first I thought the pouches were dorky, I now sort of appreciate them since I always seem to drag down so much paper work with me from confirmations, to other documents and tickets, it does give me one place to keep everything.
In terms of tone and style of writing, I prefer the Unofficial Guide. It is a bit more adult, and tongue in cheek. Passporter is good but the tone is sometimes a bit too "golly, ghee whiz, isn't that super" for my tastes, so it sometimes has me rolling my eyes. But it is nevertheless a good solid guide and the one I'm using most frequently.
I wish there was a combination of the Unoffical Guide's style, written for the seasoned traveller, with Passporters form factor. That would be ideal for me. But then again, each have found their market. Chacun son gout.