In D2:ED with my warrior, trying to take out some tough, higher level opponents by the depleted ore mine in the fjords, I found the mage head much better than the ranger head, which in turn was better than the warrior head.
In DKS I tried the warrior head with my ranger (a couple people playing necromancer / summoner type builds highly recommended that), but found that if the creature wasn't being less aggressive attacking opponents, it was running around drawing more opponents into the fight that I otherwise could have taken on separately. I ended up going back to the mage head.
