What is the best Actionscript3 3D Engine?

Question

I am looking for a somewhat detailed explanation of which 3D Engine for Actionscript3 is the most efficient, practical, scalable, documented, community supported, etc. When

Answer 1

I'd go with Away3D, if only because we know they are working so closely with Adobe to make sure that people's existing knowledge of their product translates as easily as possible to the upcoming Molehill version. If you're not already aware of it, Flash Player 11 is going to have an API for using OpenGL and/or DirectX 3D from within Flash. For those wishing to do 3D games and UI in Flash, this is going to be HUGE.