I'm gonna have to go with Nole this year.. I can't see how Nadal will be ready to defend that title this year. Im not entirely sure he will be ready physically to be taking out Djokovic this year
Its not like Nadal has only been out a few months. We are talking close to a year here. It will take a good 5-6 months of steady tennis to get back to a high level
Maybe Wimbledon for Nadal.