The Signature Wing and Extreme wing are the exact same wing/profile except the Extreme is made with an armored fabric. They should dive the same. Your way overthinking this.
I have the Signature wing...A dive Buddy that owns a shop has the Extreme. Visually, you hardly notice the difference. In his opinion and mine...it is overkill unless maybe you were doing wreck penetration, or something. Even then it wouldnt be the ideal wing for that.
I've had my wing...the signature for about 3 years now. Its pretty sturdy...abrasion resistant. Not floppy looking at all, even today, the shape is as good as it was new; A good quality product. My advice....give some thought about what you NEED from a wing.....do you need armored fabric with the diving you are doing? I know lots of divers that do wreck penetration and cave diving and they aren't even using wings with Armored fabric. Just seems like you get the same function, same wing...for less money rather than spending money in a feature that is of no real cost benefit to you...well, me at least. Only you can answer that.
I can see the Extreme Wings being very advantageous for Public Safety Divers or Emergency Response teams...which I feel these wings specifically target.