Netflix shows older movies and older seasons of shows, where Hulu+ gets a lot of newer episodes of current shows. For instance, with Hulu+, I watch Grey's Anatomy, Up All Night, Biggest Loser, etc.. They are all available the next day after it airs.
I think if you're into watching a lot of older movies, documentaries, or complete seasons of shows, then Netflix is best. If you prefer current shows and episodes, Hulu+ is a better choice.
Personally, I prefer Hulu out of the 2. If I had to keep only one, it'd be my choice.