Carbon for both crossbow, and regular compound.
When I bought my WickedRidge a few years ago it came with 3 aluminum bolts(not sure brand). 1 arrows didn't survive 3 shots in the block, the other two bent after passing all the way through a deer. I wouldnt doubt if they bent on contact with the deer hide. Since I've bought 6 carbon arrows and not a single one have bent, even after shooting a deer and it sticking in the ground.