I normally prefer reading the original book to seeing the film version.
The first reason for enjoying the book more than the film is because a book usually takes several days or weeks to read where as a film only lasts for two or three hours. So I can enjoy reading a book for much longer than watching a film. Furthermore, be cause most films are much shorter than books, the director has to cut a lot of the interesting details from the story. As a result, films only show the most important scenes of the story and don't usually tell the audience what the characters are thinking.
Another reason I prefer the books is that when you are reading a story you have to use your imagination. The reader imagines what the people and the places in the story look like and how the characters speak. However, this isn't possible when you watch a film because the director makes the decisions about the appearance of the characters and the scenes.
Finally, reading a book is a great way to relax and to enter the world that the author has created. You can read a book anywhere you like - in bed, on the beach or on a train as you travel to work. While it is true that these days you don't have to watch a film at the cinema or on TV it is still much easier to take a book with you and read a chapter when you have nothing else to do for half an hour.
So, although it is much easier to watch the film adaptation of a novel than to read the original book. I prefer reading the book. It lasts longer and gives me more enjoyment, it allows you to use your imagination and it is a very good way to relax.