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"Solid Snake (real name David, commonly referred to as Snake, and later referred to as Old Snake), was a former spy, special operations soldier and mercenary. He was a product of the Les Enfants Terribles project and "son" of legendary soldier, Big Boss, along with his "brothers" Liquid Snake and Solidus Snake.
Possessing an IQ of 180 and fluent in six languages, including English and French, he was known as "the man who makes the impossible possible" and his exploits made him into a living legend among the military black ops. Initially a Green Beret, Snake was later inducted into High-Tech Special Forces Unit FOXHOUND in the mid-1990s while it was under the leadership of Big Boss. Repeatedly tasked with disarming and destroying the latest incarnation of Metal Gear, a bipedal nuclear weapon-armed mecha, Snake would thrice avert potential nuclear catastrophe, becoming a famed war hero." - http://metalgear.wikia.com/wiki/Solid_Snake
Vs.
"Lord Voldemort was generally considered to be the most dangerous Dark Wizard who had ever existed and proved himself capable of holding his own well even against an Elder Wand-wielding Albus Dumbledore. Voldemort claimed he had experimented and pushed the boundaries of magic farther than they had ever been pushed. Albus Dumbledore himself also stated that Voldemort's knowledge of magic was more extensive than any wizard alive, and that even his most powerful protective spells and charms were unlikely to be effective if Voldemort returned to full power. This, coupled with his apparent lack of morals make him a very dangerous adversary indeed. Voldemort has shown the ability to contain spells and release them in a blast that resembles a shock wave. Young Tom Marvolo Riddle utilised magic without the use of a wand or even knowing the very existence of magic itself. He had a power to communicate with and control animals, and inflict harm on those who opposed or annoyed him. His unnaturally high level of control marks him a prodigy even as a child."