The "confusion" with carbon arrows comes in the fact that they react different than aluminum.
They resist flexing a little more at release, and they try to straighten themselves a little faster at release. Therefore, they ACT like an arrow of heavier spine. That's it. Keep that in mind when choosing a shaft deflection.
I love Wood arrows for what they are, I USE Carbon for what they are, and avoid Aluminum for what they are.
For me, it comes down to economics, I can get the most out of my money with Carbon, every time, hands down.