How does AngularDart compare to AngularJS, on a feature level?
Does it have all or most of the features from the new 1.3 release?
AngularDart closer to AngularJS 2.0 (AngularJS 2.0 will be based on ideas from AngularDart).
The´re a bit different. Actaully the AngularDart has features that 1.3 don't have, like the new router, and I'm sure there is something in 1.3 that don't exist in AngularDart. But AngularDart seems to be the more "advanced" one.
Does using AngularDart means you can code with types and get decent auto-completion ?
I know it can compile to regular JS, but does it really works well with non-chrome browser ?
It works just fine with a non-Chromium-based browser. You need to include the shadow DOM script though, since AngularDart depends on that.
Autocompletion and safe refactoring in IDE (in WebStorm, for example).