That's hard to say, and impossible to isolate into a single feature. I like the ability to collaborate either using symbol/layer referencing or Project Sharing. I like the streamlined design workflow. As a set designer, I can 'sketch in Vectorworks, turn the sketches into rendering, finesse the details, improve the renderings and create working drawings for the shops. I like the ability to collaborate, modify the model and have the modifications flow throughout my documentation. I like being able to share the model with the lighting designer (when I'm not also the LD) and the sound designer.
I think it's critical that we all work together to ensure smooth and safe installation.
The addition of Vision and the integration with Lightwright helps all off the design team, and the entire production team, not just the LD. Review collected by and hosted on G2.com.