I have to agree with Phantast:
Once really well used to both interfaces Bryce works faster. It's easier to accurately place objects because of the fast switching between bigger views. It's able to handle more objects at once etcetera.

Once the scene is ready and you want to render it then Vue is better and faster by far (that is... if you don't enable too many gimmicks).

For me enough reason to use Vue for now. Doesn't mean I don't miss the, in my opinion, faster and easier to use Bryce interface