Question is what you're after. Those are all mighty fine hubs, but I can't really think of anything where the Alchemy is at least as good as the other two, save for DA saving you some money and CK coming in a lot of different colors.
I have quite some miles on DA and Alchemy hubs and have a set of CK hubs here waiting to be built up, and to be honest it all came down to coincidence and mood which I bought. FWIW, when my gf felt she needed new wheels, she ended up with the DA/open pros. I'm not sure if that was because she wanted those the most or that's the one set I protected the least.
Pretty sure so far this reply isn't helping a bit, and to make things worse, I'll throw one more in the mix. I like Tune hubs a lot as well. These hold up really well in MTB use and are a bit lighter.
Oh, btw, I moved this thread from the review section to the general section of the board, just in case you wonder what happened.
"Nothing compares to the simple pleasures of a bike ride," said John F. Kennedy, a man who had the pleasure of Marilyn Monroe.