Would you rather watch the movie, or read the book?

For Example—> Numerous people who read the book Twilight, tend to say that the movie was pretty lame, or just that comparing the book to the movie, the book was WAYY better.

What would you rather do? Watch the movie first and be impressed, or read the book, and then watch the movie and be disapointed?

I myself, would rather watch it first than read it. Although i have not read it yet, i plan to. My sister on the other hand, says that she would rather just read the book and not watch the movie at all. >_>