The Aerostuff has a much greater response.
What are the units of "response" ?
AS snaps back into shape far more quickly than the 5PT though
If there is ONE
single thing that I like about 'Stuff over Skyshark/Avia is that when the spars are being banged around, flexed this way and that, that it appears more damped, less prone to wobbling on after the event. You can do a little bench experiment to show this. I wonder if a little video is in order.
Doing a quick snap turn the spars will flex and then return to shape very quickly, which really helps corners look crisp.
How about Icones?
Towards the AS's but not quite there. I'd rank them Skyshark/Avia -> Nitro/Icone -> Aerostuff. But there's absolutely nothing wrong with Skyshark/Avia.
Keep in mind though that personal preference is much more important than anything you might be able to measure. Someone sold me a 'Stuffed Cosmic 'cos they preferred the Icone version. What a weirdo.