My wife is loving this book. It's very different from other cookbooks. It's more narrative, and teaches you how to think about cooking rather than just providing recipes to follow.
I highly recommend checking out some of his videos here https://www.youtube.com/foodwishes
Food Lab gets much deeper into the chemistry and the why / how than the TV series. I was kinda hoping for some more direct cooking guidance rather than having my appetite whet by the show, but it was still fun to watch.
The book is super informative and useful for thinking about how to build dishes that will taste good. The show seems more like a food travel show that is semi based around on of the items.
Both are good, but if you were impressed by the show, the book will blow you away.