Dumbledore, because his power is much more expansive than Voldemort's.
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Originally Posted by
Sordane 
What I have been trying to say through all these past entries, is that Voldemort had more potential in magic than any wizard in the series.
You keep bringing up raw power/potential, and yes Voldemort has a lot of it. But what else? There is love, which Voldemort doesn't have. Then there is the saying "Knowledge is power". Dumbledore knows more about Voldemort than Voldemort knows about him.
Influence is also power. Dumbledore is able to influence people in positive ways, which are more powerful, and more effective in general, than negative ways. He doesn't rely on dominating and instilling fear in others.
And of course, he's no slouch in magical skill. Remember the examiner in OotP who said that Dumbledore did things with a wand she'd never seen before -- and he did that when he was still a
student.
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Originally Posted by
Sordane As with the real way, where it was a stalemate, even when Albus had the elder wand.
Speaking of magical skill, I disagree with this point. The duel could've gone longer; the reason it didn't was because Voldemort changed tactics and tried to possess Harry.