Tom wrote an answer about Black Diamond Cobra Ice Tool on December 26, 2011
Depends on what your doing with them. On ice they both work well, the nomics require a different swing, more wrist action to set the pick, while the cobras are more of a standard swing. For pure ice the cobras are the way to go, especially when its fresh. For mixed/drytooling or climbs that are hacked out already (like Vail or the ice park)the nomics might have the edge, but they both perform well on most every type of climb. It mostly comes down to how you use them. As for the picks, the new BD picks work great, they get stuck less and haven't broken any this season.