The link below is a BYU paper on the use of these materials, mostly related to reinforcement fibers, but at the end of the paper there are tables of properties. Properties of Kevlar & Spectra

I'm still not sure of the UV sensitivity of Kevlar. I know sailmakers noted a problem but then Kevlar is used for lines in both parachute and paragliding wings. For now I'll stick with Kevlar as it is fire resistent, where Spectra "burns readily".