Martin isnt actually a qualified nutritionist, he is just a knowledgeable guy who invented a website. He does know his apples though, but from reading and practicing both guys methods, if you look at the quality and attention to detail in there information, Lyle is on another level. I mean I don't even think Martin has one book out and his website is a mess. Lyle one the otherhand has a list of great books and his website and forum is great.
I've heard a rumor I read earlier on lyles forum,don't know what truth is to it, Lyle and martin were supposedly talking about doing a book together called leangains 2.0 and this may have had something to do with them falling out.