Both bikes come out to the same price. I have to say, after just riding the Superfly, I liked the feel of it ALOT. He has it set up in an agressive racing style. The Trek X-Caliber felt more like a cruiser bike. The Superfly is a full carbon frame.

My DH is normally completely against buying used bikes, so imagine my surprise when he told me just a minute ago to go for the Superfly!

I'm going to do some more research, but I think you can figure out which way I'm leaning . . . .