The eternal question: which heroes are better, mages or warriors?

I enjoy playing as mages, and among the non-magical secondary skills, logistics are essential, and possibly pathfinding as well. The Dragon Mage in the Armageddon's Blade campaign is a good example, where in one of the scenarios, he has to defeat a legion of nagas with a tiny army; a warrior simply couldn't manage that (although there are also situations where the opposite is true). With the right combination of spells, a mage can be very powerful, but, as has already been noted, achieving this is not easy. :)