Magic.
Generally the fighter with more "tools" will be the one to survive, and in my opinion, that's magic. Magic can paralyze, it can use AOE effect in a radius, it can absorb or resist incoming attacks, it can summon and stagger and heal and confuse. A mage can also enchant gear to empower himself, something the voice could never do. There's all sorts of possibilities with magic, lore AND game mechanic wise.
The voice on the other hand? 90% of them are just different ways to deal damage....
In reality, the Voice can be used in any way you can think of. As seen with the three Nord heroes who banished Alduin, you can create new Shouts with deep emotional or spiritual experience. Magic, you can as well but there are limitations to what magicka can do. Unless you're Magnus.
The tools of the Voice are limitless. Storm Call, just one shout, can send a flurry of lightning bolts at your enemy and everyone around you with no effort on your part after the Shout itself. Unrelenting Force can incapacitate anyone for a few seconds, just like paralyze. Become Ethereal can provide total invincibility for a short time. For the coup de grace: Slow Time.