I'd rephrase that as "the books is almost always better than the movie". Most rules have exception and the use of "always" in a claim usually makes it too easy to falsify -- particularly in highly subjective fields such as appreciation of film / literature. Another counter-example would be Trainspotting: My 25-year old self found Danny Boyle's film to be much more coherent, interesting and enjoyable than Iriving Welsh's book. (FWIW, I've upvoted your comment as I don't think it deserves downvotes).

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The Sweet Hereafter