There are probably many things you should learn.
Emberjs is 42k minified + gzip, and Backbone.js is only 5.6kb. Emberjs puts a lot of energy into it that doesn't give you bean bases.
Analyze if you need all these features. If your requirements are covered only by Backbone, IMO, you should give Emberjs a pass. Delivering all of these extra bits to use is not stupid.
With Emberjs, you'll also have to use jQuery. Not sure if you are already using it or not.
IMHO, I would use Emberjs if the single-page web application is supercomputer with a lot of feature requirements that should be sufficient for Backbone.
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