CARBON. They don't bend. Went through to many aluminum arrows because of them being bent while practicing. That's mainly why I swithed over to Carbon. Carbons will break, but it takes a lot to break them. I've shot multiple deer with the same arrow,(p [no swearing please] throughs of course), and the arrows are fine.
Carbon for the same reasons as the others. Ive been shooting Easton Carbon Evolutions since they came out, which is about 6 years ago maybe, ????
I still shoot many of the original shafts I had bought, and only a few have been broken, lost or tossed due to stress weakness.
Im sure all you guys know it, but dont forget to flex check your carbon shafts for weakness, or for splintering, splitting etc. As an arrow gets shot more and more, or when it hits hard objects, the carbon fibers break down, which can cause the shaft to explode on release. If you havent seen the pics of the carbon shafts through the hands and forearms....Do a search on the web...Not something anyone wants happening!