I am a sucker for dual narrative. I love love love it! Some of my favourite books have dual narrative. I think I love it because it adds another dimension to the novel and it allows to see extra information as well as get to know the main characters more intimately.
Perfect Chemistry is a wonderful example of dual narrative done right. As it a hate to love relationship it shows the development of Alex and Brittany's feelings and at what stage their feelings changed.
A less traditional form of dual narrative is Thirteen Reasons Why by Jay Asher. It alternates between Hannah's tapes containing the reasons why she committed suicide and Clay's reactions. It made the book that much more dramatic and haunting.
The Noughts and Crosses series isn't quite dual narration. Over the series there are multiple narrators in the books, some characters only narrating once. It just gave the story a more rounded feel and felt very detailed. An awesome series.
What do you think about dual narration? What are your favourite dual narrative novels?