I think when you take aspects of each book, you end up with a more complete picture of optimum nutrition. I don't fully agree with the stance of either book - (this might sound funny, but one of my biggest issues is actually the position they both take about alcohol. I can't remember exactly what it says but in Stephen Harrod Buhner's Sacred and Herbal Healing Beers, he talks about how alcoholic fermentations of one form or another have been used by most cultures since pretty much the dawn of time, because people don't make alcohol, it makes itself.)
The fats thing is kind of incomplete in both books, but if you take them both and split them down the middle I think it gives a more accurate representation of the truth (imo animal fats aren't bad and we shouldn't avoid them, but when they've been "tampered with" by feeding the animals inappropriate feed, like grains, they become unnatural). I don't like the way GoE is so technical with food, especially as I'm finally learning to fully trust my instincts and I know they are steering me the right way - as a nursing and pregnant woman, I need more fat now than I did pre-babies, and I'm sure I'll need less when I'm done having babies. So, while in GoE they say how to "know" if you're getting too much or too little fat, they still start at the everyone-being-equal-needs-this-much-based-on-weight point, which kind of bugs me because my fat needs vary tremendously based on season, location and time of life, kwim? Also, I do believe that now that I've found grassfed milk, it plays an important part in my diet - it plays big in my religious mythology and I feel a strong connection to using dairy.
But I love GoE's veggie "push" and the grain/legume part of their philosophy resonates quite strongly with me - maybe not going no-grain, but very very low grain is necessary for me to have enough energy - I think even in agricultural societies it would have been a ridiculous amount of work to eat as much grains as the Canadian and American health organizations recommend due to the intensity of labour to process the grains prior to machinery. I also really like their chapter on why organic matters, and totally identify with the environmental/population arguments.
Anyway, I digress, I find both interesting, and they sort of fill in gaps in each other, imo. They're kind of the same philosophy, but with the strong emphases in different places.