I would say
Everything Is Illuminated. The movie, though not first-rate, is well-paced, sometimes moving, and full of wit; the novel by Foer is pretentious, plodding, pretentious, overinvolved, pretentious, boring, pretentious, and did I mention that it's also pretentious?
The BBC's serialization on PBS of Evelyn Waugh's Bridesehead Revisited was equal to and often time better than the book. But that was TV.
I think that the book and the television series had different strengths and weaknesses. The series sometimes wasted time having things happen on screen just because they happened in the book -- I think someone described the screenplay as a work of "stenography" -- even when they made no sense and had no purpose in that medium. A lot of the ironic humor of Waugh's prose was lost. On the other hand, it had some wonderful acting turns (Nicholas Grace as Anthony Blanche, John Gielgud as the elder Ryder, and whoever it was who played the oafish Boy Mulcaster) and the viewer got to drool over a lot of beautiful costumes and settings.
By the way, I will mention for the benefit of anyone who may be tempted to read some of Waugh's work that
Brideshead, though Waugh's most commercially successful novel, was also one of his worst, even in his own estimate. Do NOT start your reading of Waugh with
Brideshead, which is kitsch. Almost any other novel by Waugh is better:
Decline and Fall, Vile Bodies, Scoop, A Handful of Dust, etc.
Atonement.
The book had a paper thin plot, moved slow, and the author would meander on with loads of descriptions giving the book a sort of pretentious feel to it.
The movie had all the good things about the book, plus great actors and a great score. Plus, the ending had more of an impact for me than it did in the book..
Thanks for the warning. I watched the movie on DVD and it made me curious about MacEwan's work, though I was not sure that what I had seen on screen would be worth a whole book of narrative. If I read MacEwan, I'll start elsewhere.