You should dig around, ignore claims of cleanliness or ease of use, read a little source code, and see which one floats your boat. One way to get a good idea a

You should dig around, ignore claims of cleanliness or ease of use, read a little source code, and see which one floats your boat. One way to get a good idea about how useful these frameworks are in practice is what's being built with them. (I work on Backbone.js) You can take a look at the sort of apps folks are coming up with by scrolling through here: http://documentcloud.github.com/backbone/#examples http://documentcloud.github.com/backbone/#examples ... keeping in mind that Backbone hasn't even been out in the wild for a year yet, at this point.