Of the two choices, I would definitely continue to use Ember.js. Backbone is disqualified due to obvious, reknowned scalability issues; most apps need a plethora of plugins and framework enhancers that jell dubiously and weigh your app down as much as a heavier framework like Angular or Ember, so why bother? Between Angular and Ember, I would take Ember's API over Angular's directive fanaticism any day.
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Of the two choices, I would definitely continue to use Ember.js. Backbone is disqualified due to obvious, reknowned scalability issues; most apps need a plethora of plugins and framework enhancers that jell dubiously and weigh your app down as much as a heavier framework like Angular or Ember, so why bother? Between Angular and Ember, I would take Ember's API over Angular's directive fanaticism any day.