OK, agree that "Roman Holiday" works better as a romantic comedy. By my lights the challenge faced by the filmmakers of "Breakfast at Tiffany's" was that Truman Capote's novella is NOT a romantic comedy, so they had to do some genre-bending or to genetically modify the original for the movie.

The result has always seemed to me to be one of the best rebuttals you can make to people who complain that movies are not "faithful" to the original. You could hardly find a movie less "faithful" to the book than "Breakfast at Tiffany's," but it works on its own terms.