Promises are superior in general, I guess that has been discussed already[1], many times. Promises may indeed offer just an insignificant benefit sometimes (you can even call it just a different style), for example when you are first writing a monolithic prototype. In this worst case, you would simply make a giant chain of ".then" methods, any your gain is you can get creative with the error handling if you want. However, the greatest benefit revels itself later: The composability that comes with them will help you immensely when refactoring.

[1]: One example: http://softwareengineering.stackexchange.com/a/302456/9451 Another: http://blog.parse.com/learn/engineering/whats-so-great-about...