Should I use Angular, aren't React, Ember and Aurelia so much better?

Let's discuss the various front end JavaScript frameworks. What are the pros and cons of each of them? Is one REALLY better than the others; or is it just hype and preference allowing us to engage in flamewars?
Once we all come to an agreement on the one TRUE front end framework, how do we convince our bosses to rewrite all of our apps to use this gift from the gods? Or, how do we at least convince them to let us use it on new projects?

This will be a panel discussion with a panelist representing each of the frameworks. If you'd like to be a panelist and have experience with a framework, contact Pete Clodi to sign up and I'll send you more information.