Cometic or Wire-Lock Head Gaskets?

I've got to choose between the Cometics and Wire-Lock gaskets. Since I do not know anyone that has experience with either, I thought I'd ask here. Which are better? I'm running ~20-psig boost. Thanks.

i like cometic because they require no additional machine work.

>and you can get them in about any thickness (Cometic gaskets)
I got mine from http://www.cmotorsports.com/

yup, got mine from combination motorsports also!