andreas0912 :
So now that the answer is clear that the DH15 is better, there is another question. Is the difference so much that it's worth the extra $20 or should I go for the DH14
You may not get any difference in OC between the two coolers, it's likely you will hit other limits with your setup that aren't CPU temperature first.
Even if you did, I don't think the extra ~200mhz would be worth the $20