which kenda rear tire is better for GNCC

[cdquad]

I have always ran razrs in the past, but I think I am going to try some kendas on the rear. I wanted to know which kenda is better for GNCC the klaw, Knarly, or knarly XC. I also noticed the knarly XC is 21 inches. Didn't if anyone could comment on that.
Thanks!

[krt400ex]

alot of the pros that use kenda run the knarly tire