Clutch Material

[teddy]

So I'm in the market for a new clutch due to the KYB one that came with my motor isn't going to last a whole lot longer. I was looking into Unorthodox clutches, seeing as how I've never really heard anything bad about their products. I notice with their kevlar clutches, they have the option of full face or windowed kevlar. I obviously see the physical difference, but whats the performance difference between the two?