Hi Tami,
The link to vendor's zylon site is http://www.toyobo.co.jp/e/seihin/kc/pbo/menu/fra_menu_en.htm
If mechanical properties were the only factor, Zylon or carbon non woven cables would be the winners. But carbon is fragile and Zylon is afraid to come out into the sunlight. Also if you have parallel (non-woven) strands of fiber it's almost impossible to devise a way to ensure they are loaded equally. There is at least one company making non woven carbon standing rigging but it looks incredibaly expensive and wouldn't work for trailer sailors.
I use the Precourt dead eyes for standing rigging including diamond stays on my trimaran. I experimented once with kevlar diamond stays for my Tornado. I took a 10 lb spool of kevlar tow and made about 20 wraps around the spreadres, mast hound, and a mast base adjusting turnbuckle. I wetted the fiber with epoxy and loaded the rig up while it cured. Then I primed it and painted with the same awlgrip used on the mast. Not too scientific but it worked great for three years. I'm guessing it was about 3mm in diameter.

Kevin