Adrian Perez is right.

The discussion is incomplete without #ReactJS.

If you see Google trend,

https://www.google.com/trends/explore#q=angularjs%2C%20reactjs%2C%20Backbonejs%2C%20Emberjs&cmpt=q&tz=Etc%2FGMT-5%3A30

You will find ReactJS is way hotter than BackboneJS or EmberJS.