I am personally a huge book nerd but I also love a good movie. In this article I will be discussing the pros and cons of both.
First of, in books, the images of characters and scenery must be visualized from your own imagination. Depending on who you talk to, this can either be seen as a pro or a con. For me, it really depends on the book and the author of the book. For example, in the book "the alchemist" Paulo Coelho does an excellent job in describing the image. A clear picture can easily be visualized when reading it. But, in other books there could be very little detail in which case the setting may be difficult to see. In movies, it's guaranteed that the image will be clear, but on the other hand, it's very strict and allows for no imaginative outlook on the appearances.
Another thing different is that in books, it will most often tell you what the characters are thinking. In movies, thoughts are generally not included. This is not always the case, there ARE a few exceptions, but for the most part this is how it works.
I don't really have a preference between books and movies, but that was just some outlook on the differences.