I only played the demo of Great Cow Race but I would have to say that:
Book>>>>>>>>>>>>>>>>>>>>>>The games.
No offense to telltale. But my descision is this because the parts that the game covers are really the game-friendly parts of the overall story, but also the way that the honey puzzle was solved. Personally I thought the one in the book
where he simply climbed the tree and came back with the honey, but got all beat up in the process was better and flowed better (and less anti-climatic) than the in game one's
Put hay cart on fire and make the cow charge into the area where the bee is to smoke him out.. I know they did it that way to be more "game-friendly" but still didn't seem as good to me. (but that may be partially because I kept trying it like he did in the book.

)
Don't get me wrong, I thought the did a good job of bringing the book world into the game. And I did like the Cow Shooting Game and Muscle Man Society (or whatever it was called) brothers. Just perfer the book version.