Thanks for introducing AngularJS. It looks really cool. The object-oriented aspect of ExtJS plus its extensibility is super awesome, but it starts to feel more and more like one bloated sinking boat with the latest releases plagued by bugs and major performance issues. Also, if you look at the HTML generated by ExtJS components, it's pretty ridiculous. Once you go ExtJS, you are locked down to the framework. That can be both good and bad...
The declarative style of programming saves you a lot of coding. This feature would simplify Ext JS controllers as well if it were available.
If I may correct my own post... AngularJS is really not a framework. AngularJS developers call it a meta-framework, but I don't think this is a good description either. I'd rather call it a (proprietary) language that extends the HTML vocabulary.
I'll give them credit for being innovative, but I'd say the more I research AngularJS the less excited I'm about it. AngularJS parses HTML and it adds custom ng- attributes. AngularJS is about declarative style of programming, and while this approach might work for smaller application, it will be slow on larger apps due to the need of parsing.
I don't care about the Dependecy Injection pattern that AngularJS uses. I prefer the define/require pattern.
Finally, there are relatively few open source reusable components built w/ AngularJS.