Why should you have to choose between either of them.
Both of them are different in there own ways. Like how when you watch a Movie there is people that can talk and that make different sounds.
Books you have to imagine it and think of it in your own way, like if the storie was talking to you about the main character and his or her friend getting into a argument you would have to imagine in were as when your watching a movie it shows you them in it.
Books probably would be useful and exercising if you are trying to stay off of the Internet or doing a challenge for a few days or weeks.