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

Personally, for me, the Mage is always the best hero. And it doesn't matter if he's a combat hero or not. Mass slow and speed boosts, plus healing and the town portal – it's almost a cure for all ills. And in general, there are battles with neutral creatures where a Warrior will NEVER win. The Mage can win battles where the enemy has hundreds, or even thousands, more troops.