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Here, as everywhere else, better balance is preferable, but... a good mage is stronger than a warrior, even if the warrior is stronger in terms of power and army. I've been convinced of this many times. When you can't take a single step, and before your first powerful warrior can do anything, he's either dead or far from powerful, demoralized, and with a sad red square instead of a green one.
What do you think of this situation: you're playing as mages - "Tower," and I'm playing as warriors - "Humans." We meet, and I have 20-20-10-10, while you have 10-10-20-20. I use tactics to move all my units, cast Haste, and all my 7 units move faster than your fastest unit. With such defense, you'll have almost no one left. And then what? Well, you'll explode someone, blind them, or curse them. But how will you attack further? With each attack, you'll receive much more damage in return. IMO, only warriors or battle mages are effective, depending on the situation.