Albus Dumbledore is a more powerful wizard then Voldemort.

3) The things which Voldemort knew not! (While Albus did) Voldemort has always thought himself superior to others. - He thought he was the only one who knew of the room of requirement (Deathly Hallows). While Albus didnt claim to know it all, he did find the room, and was the first one to tell Harry of it (Goblet of fire). - Magic always leaves a trace. Voldemort created, hid, then felt certain that no one would ever find his horcruxes. Albus was able to track, find some, and greatly help in their undoing. - Death. Voldemort has always feared his own mortality. He went to the length of creating 6 horcruxes, plus another one unknowingly. He consumed unicorn blood. All these, just to keep a tether to life, no matter the cost. Albus thought of death as the next great adventure. He knew there was not a reason to fear one's death, as it eventually comes to everyone. - Prophecy's hold. Voldemort took the bit of prophecy he knew of as if it were written it stone, as if he had no choice but to follow through with it. He was so blinded by its existence, that he himself ended up putting it in motion, thus making Harry his equal. Albus knew that prophecies are just that - prophecies (from the dictionary: prediction or guess. the act of uttering such a message) do not mean you must follow through. Albus knew a person has the free will to turn around, and walk away from a prophecy. Albus also knew Voldemort well enough to know that he wouldnt walk away from it. - Love. One of the greatest, most powerful powers in existence. Voldemort knew none of it, underestimated its power, and understood none of it, either. Albus knew of it, used it for the greater good (Philosopher's Stone), as well as against Voldemort (Goblet of Fire). 4) Elder Wand. The wand chooses the wizard. For a wand to work properly for its owner, it either has to choose him/ her, or to be won, so that it allies itself with its owner. Voldemort clearly does not fully understand this. He tries to figure out who he'd have to kill (as he sees no other way to accomplish it, which also speaks of his lack of understanding) in order to get the Elder wand to ally with him, and only him. He fails miserably. Albus knew all this, and in his brilliance, orchestrated the passing of the Elder wand o another wizard (not Voldemort). Albus won the Elder wand fair and square. Voldemort resorted to stealth, and then killing to get the wand, in attempt to try and properly earn its loyalty. The wand could never be 100% loyal to Voldemort, who didnt take the proper steps to find out who is really belonged to, and earn its allegiance. "Maybe a man in a million could unite the Hallows, Harry. I was fit only to possess the meanest of them, the least extraordinary. I was fit to own the Elder Wand, and not to boast of it, and not to kill with it. I was permitted to tame and to use it, because I took it, not for gain, but to save others from it." 5) Powers, or Skills. Like I said before, both wizards possess incredible powers. Its tough to pick the stronger one. However, I believe Albus Dumbledore to be the more well rounded, powerful wizard. Its not only about how brilliant one's marks are at school. Its also about other achievements, too, such as legacies left behind you in the end (silly example, but it meant a lot to Albus: chocolate frog card, anyone?), contribution to the community at large (Ministry, Order of the Phoenix), passing on the knowledge and skills to younger generations (Hogwarts). "It is our choices...that show what we truly are, far more than our abilities." To mention only some of his many varied powers/ skills shown throughout the books, Albus has: - Sheer brilliance. Time & time again, he has played a huge part in thwarting Voldemort over the years: for examples, Order of the Phoenix, evoking the ancient magic which played part in keeping Harry safe through the years (along with the magic which Lily evoked, of course), Mirror of erised, etc. Then eventually playing a big role in his demise, as well. - Transfiguration. - Patronus, and patronus messages. - Legilimency, and occulemency. - Does not need a cloak to become invisible (also known as, very powerful disillusionment charm). - Wandless magic. - Alchemy. - Speaks Mermish, another unknown language (Half Blood Prince), understands Parseltongue. - Firestorm. - Last on my limited list here, we must not forget that Albus was tempted by power in his youth (Deathly Hallows, Grindelwald). Its not that he does not possess any dark powers, but rather he chooses not to use them (Minerva McGonagall says so in the first book), and he chooses not to fall prey to the quest for power like he did as a young man. :)