Dear Didge,
For me, no doubt whatsoever...I will take the books! Movies just never capture the nuances like books do. One movie I thought might be an exception, because it was so good, was REMAINS OF THE DAY... Emma Thompson and Anthony Hopkins.
But then several years later I read Kazuo Ishiguro's novel...omg...it was magnificent, left the movie in the dust.
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One REAL exception might be Howard Hawks' TO HAVE AND HAVE NOT, because I read he made that movie on a bet...that he could take a really bad short story and make a great movie from it! (And of course the rest is history...)