backbone is a fully flexible wireframe design and can be used with grapes without any pain (and I used it with Grails). I am compatible with most js libs (jquery, zepto, etc.), with most client-side template languages, etc.
ember , as I see it, is of a higher level, but has some limitations for your application architecture, for example, it works best when you use handlebars . Therefore, you need to learn at least a new template language. And I'm not sure if there are server-side rendering tools for descriptors (for the case when you want to also display the page on the server side)
Igor Artamonov
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