Gee, Sharky, look what you started. I went back to your original question and noticed it doesn't say what kind of boat you sail.
Remember, on some boats (like mine) you can change the shape of your sail with enough downhaul to bend the mast. If you are using dacron, you have to be careful not to rip the sail in half with a 16:1 downhaul. It doesn't seem to be an issue with the Pentex. (yet) I just got new square-top Pentex sails for my P19. They're great.
My opinion is: Pick your sailmaker, then follow their suggestions on fabric.