For me, Angular displays the right balance beween complexity and ease of use. After getting past some of barriers (the transclusion docs could be more easily ex

For me, Angular displays the right balance beween complexity and ease of use. After getting past some of barriers (the transclusion docs could be more easily explained, specially with some images), I find it pretty easy to use, and it's great for complex apps. Never used Ember though, after using Spring for so long, dependency injection comes naturally. Some people mention Backbone, I think it's great if you're very comfortable with JS, otherwise you'll end up replicating bits of other frameworks by hand or using lots of 3rd parties (ex: databinding, validation, complex model interaction, view cleanup). Anyway, take a few days to get the feel of each and choose according.