As someone who has worked extensively with Ember and Angular in large projects, I'd say that I prefer Angular even though I know the current version will be deprecated.

I've found that ensuring functionality is locked into tiny angular modules and proper project structuring makes working with the framework a complete breeze. The testing framework that is inbuilt is mega handy too.

That said, the ending conclusion that we should be wary to jump on the Angular bandwagon is not unfounded. I'm a bit wary, however, of Ampersand since it looks a LOT like Ember, and well... I'd just use Ember if I wanted that.

Aurelia looks quite promising. There's not a lot of info out there about it, so I doubt a lot of people will start jumping the Angular ship just yet, but it's something interesting to keep an eye on.