Depends on what I'm doing and what the book is. Like the Lord of the Rings I'd rather listen to. But if it's Eragon, I'd rather read it. Also I can listen to it in the dark, while playing video games, 或者 doing math.
Read the book. It makes me feel like I'm getting smarter, even though I'm probably not, and I'm not that lazy that I want someone to read a book for me. I'm very lazy, but not that lazy.
I hate audio books, for some reason I can remember and imagine things better if I read them myself. With audio books, most of the time my mind just starts wonder to other things and then I don't even know what it's going on in the book.