Wow

Very good question.

I've often maintained that AL was a great frame material - the dapeming from a bike comes mostly from the tires, fork, and the seat post if done correctly. But I will say that when I've done back to back comparisons, the Carbon always wins out.

Interestingly Salsa said their latest generation Warbird (not next years) aluminum frame is more compliant than their Ti frame...

Anyway, I love the ride on carbon - haven't found such a nice ride on Aluminum yet, although I have read about it (specifically Salsa and Sepecialized hydroformed Al). you don't need to be a pro rider to benefit from that.