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

Is it possible to argue this point?
It is generally accepted that Warriors are superior to Mages. Do you have any successful experiences in online games playing as a Mage against another player?

No, I don't play online. To be honest, I don't know how this is possible yet. Perhaps it's necessary to consider the level of both players and the spells available to the Mage. (assuming equal armies)