Which do you think is better; read the book first or watch the movie first?

 Every one that loves to read always chooses to read the book first rather than watching the movie. But sometimes if the movie already came out, people would rather watch the movie first. Me, I love reading so I will always read the book first. People who can't read, always prefer to watch the movie only and never read the nook or have someone read it to them. What do you prefer to do first. I want your opinion, my fans. Do you prefer to read the book first or do you prefer to watch the movie first?