I'm sure that the different wing shapes play a large role in performance and aerodynamics. I am a firm believer that there is as much variation between Extras of two different manufacturers as there is between and Extra and an Edge from the same mfg. However, I have flown Extras and Edges and have felt a difference that has been pretty distinctive. It's kind of like Cubs. They don't all fly the same, but they all kind of fly like Cubs (if you've had one, you'll know what I mean). You might hate me for this, but I don't believe either model is better or worse than the other....they're simply different. They each have their strengths and weaknesses and niches within the realm of 3D flight.

Sorry if that's not the clear-cut "one is better" answer I'm sure you were looking for, but that's my opinion and you're going to know it anyway .