From what I've seen of both (and having used Backbone professionally), while backbone has more documentation on the web, the problem is it's a very flexible framework and it doesn't force much upon the developer, which is great. However, it does mean that a lot of tutorials talk in different paradigms.
As a .NET guy, I'd go for Knockout. I also like what I'm seeing with Angular.
As a .NET guy, I'd go for Knockout. I also like what I'm seeing with Angular.