Well....
the question asked is what is better for 3D work. As you can see from most of the responses is the Edge 540.....for 3D work. As far as the reference to the TOC planes, you need to keep in mind they are required to fly sequence patterns as well, so I think (I know) that is why you see all of the Extra's. If you look at the TOP 3D pilots around the country you see Edge 540's as the plane of choice. The guy asking the question needs to decide if 3D is his major need to be filled by this plane choice. If so, the Edge hands down.....if he plans on making it to the top level of IMAC type of flying then the Extra is a better choice....
I am going a different route. I fly a Cap and a Edge. Best of both worlds, but doing it with two planes. I'll have an Extra (Probably a TBM) next year....
Pug