The difference between Backbone and Angular is that AngularJS is more like Rails whereas Backbone would be more like Sinatra. What it means is , for complicated apps , you'll have to do complex stuffs anyway , so 'complicated' features are better built in the framework itself.
Unless you use a plugin , you'll have hard time updating your views automatically in Backbone if your model has nested objects. And your models cannot be arrays. In AngularJS it doesnt matter.
