The Dyson Sphere is roughly the same age as I am. Of course, the Dyson sphere is roughly 1 A.U. in radius and would be the most tremendous achievement of any society producing it, and similar claims are never made about me, at least not when I am sober. On the other hand, as of this writing, I actually exist. Advantage: Enge.
I’m not sure the Dyson Sphere concept makes any sense anyway. If you had the energy and resources to build it, you wouldn’t need it.
[Discoverblog item seen via james_nicoll.]