I love both. The books I've loved since I was 9 so they also have nostalgia value. Books are good for getting a more detailed look at things, Tolkien really put a lot of work into the background of his world that a movie just can't match. However the movie does highlight plot points that Tolkien just passes over so it's nice to see the scenes that you know happen (such as between Aragorn and Arwen) but never see in the books. I think they both aid the other, movies help you picture parts of books you might not have had experience enough to imagine fully and give an interesting different person's perspective; books fill in the blanks and details and make it that much more enjoyable to watch. Where possible I would always try and use both mediums.