Here's my summary:
* The world is easy to move around in and manipulate, which is rare for a 3d space (as opposed to Mozilla Hubs for example)
* Video chat showing up on peoples heads is much nicer than in a separate section like Gather.town
* Hear people per-room, rather than just volume attenuation is a better solution for larger meetings
* The screen sharing on a wall is such a nice and intuitive way to glimpse content from afar but still be able to full screen it
That said, my team is on Gather and we will stick, largely because we have team members on slow laptops and the 3d world of Spot makes the fans spin.
