This is getting shelved under "The Movie is Better" but honestly, I can't decide which version I prefer. Because I am indecisive, let's make lists.

Reasons The Movie Is Better:
-Audrey Hepburn plays a considerably less racist and foul-mouthed Holly, which is nice. But let's be honest: Holly could spend the entire movie snorting crack off a sidewalk and Audrey Hepburn would make it the most elegant and classy crack-snorting anyone had ever seen.
-Holly actually sets foot inside Tiffany's, instead of just talking about it. Also she is actually seen eating breakfast outside the store, instead of just mentioning it offhandedly.
-The lines, "It's useful being top banana in the shock department" and "I don't want you to take me home until I'm very drunk. Very drunk indeed."
-A happy, schmoopy, formulaic romantic ending in the rain that never fails to win me over. And they come back for Cat.
-George Peppard.

Reasons The Book Is Better:
-Mag Wildwood, a mere caricature in the movie, gets more lines, personality, and scenes in the book.
-Holly is eighteen at the beginning of the story, which makes her instantly more of a badass teen slut, which I admired her for.
-Mr. Yunioshi actually has a sizable shred of dignity and is vital to the plot. This did wonders to undo the damage caused by the sight of a sweaty, overtanned, bucktoothed Mickey Rooney leaning over a banister and screeching, "Missa Gorightry! I musta plotest!"

*shudder* Is Mickey Rooney dead? If not, could someone please find him and kill him for thinking he could successfully imitate a Japanese man without turning into a walking stereotype? Thank you.

That's all I can think of at the moment. Bottom line: the book made me sad, and the movie does not.