What about the server-side of things? If you only have to the UI sure, but if you have to write the whole thing, rails/django is going to be way less work. No n

What about the server-side of things? If you only have to the UI sure, but if you have to write the whole thing, rails/django is going to be way less work. No need for an intermediate network JSON API with all the encoding/decoding that it entails, just routing on one side instead of two and many more.