Wish I could help, I never tried Rukus or any fibreglass composite. I went straight to some "cheapo" carbon composites and it's said performance wise there's not much of a noticeable difference. You'll scratch up both and if you're clumsy they'll snap both just as easy. Carbon only really makes sense if you have something you need consistently rigid/flexing when the material is exposed to extreme differences in temperature (think planes, high performance cars, etc)
There's however a noticeable difference between plastics and composites, the later feeling a bit more responsive and "springy" (? is that a word?). Take one of your friends blades for a spin before you fork out