Aside from any warranty considerations altogether - one thing no-one's brought up at all is consumer confidence as a measure of build quality.

I'm not saying its right or wrong - just that consumer perception indicates chances of buying any one particular material over another. Posts on these forums over the past couple years indicate BF members are very reluctant to buy a CF bike or CF parts used. Not because they're inherently bad - just because they're still percieved as 'fragile' and because there's no simple way to confirm their condition.