We run Versus and are just working on automated comparisons of JS MV* frameworks—check some examples:

Angular vs Backbone http://versus.com/en/angularjs-vs-backbone-js

Angular vs Ember http://versus.com/en/angularjs-vs-ember-js

React vs Backbone http://versus.com/en/react-vs-backbone-js

React vs Angular http://versus.com/en/react-vs-angularjs

Knockout vs Angular http://versus.com/en/knockout-js-vs-angularjs

Or compare any two frameworks by using the search on Versus.