Just one? Seriously? That's like asking me to choose the most adorable kitten out of a group of adorable kittens. But if I must choose one..
Who is more awesome than goddam Paul Hudson? No one, that's who. Just thinking about how amazing HTKARS was makes my pancreas hurt.
Nothing that I could say here would convey exactly how much of an amazing this book is. It's just something that needs to be experienced.