Completing the Sig Extra now and have a DP Edge on the way. Haven't flown either so I'll leave that to others - plenty of commentary on other threads showing that the pilot is the only limitation to either of these A/C.

Bought a BME 50 with the Sig in mind but decided it was way too much power and plan to mount a Saito 180 instead. Sooooo, picked the DP Edge for the BME.

From the quality and building aspects I'd say that the Sig Extra is very close in build quality to DP, certainly much better than the GP arfs I've owned (Giles 202 & UCanDo). I've inspected a friend's DP Extra before ording the Edge and was very impressed.

I expect both A/C to be excellent performers with the Sig being more IMAC pattern oriented and the DP Edge to be a knockout at 3D.

Let me throw this off-thread comment into the fire: the UCanDo3D is the best all-round flying and 3D capable A/C for the money out there now. Flying it with a Saito 91 and learning 3D has been a blast!