It's god vs. titan
Thanos is a mutant member of the race of superhumans known as the Titanian Eternals. The character possesses abilities common to the Eternals, but in some cases far beyond any other known member of his race; acquired through a combination of his mutant Eternal heritage, bionic amplification, mysticism, and the entity Death. He has demonstrated enormous superhuman strength, stamina, and particularly durability; is able to absorb and project vast quantities of cosmic energy; is virtually ageless and immortal; does not need food or oxygen; and is capable of certain telekinesis, as well as limited telepathy and matter manipulation. The advanced technology within his transportation chairs includes force field projection, time travel, movement through alternate universes, space flight, and teleportation over interstellar distances. Thanos is an accomplished hand-to-hand combatant, having been trained in the art of war on Titan.
Thanos is extremely intelligent (he considers his mind his greatest weapon) and possesses knowledge of Celestial and other alien technology. He is also a master strategist and sometimes utilizes a space vessel called Sanctuary II as a base of operations.
http://en.wikipedia.org/wiki/Thanos
Kratos possesses incredible superhuman strength and stamina, the exact limits of which are yet to be determined. He has proven capable of overpowering the Hydra, throwing the Colossus of Rhodes after it attempted to crush him beneath its foot, and prevented both Cronos and Atlas from crushing him between their fingers. During his battle against Hercules, who is considered to be unrivaled in terms of sheer physical strength, Kratos proved capable of stopping his charges, forcing him backwards and enduring his powerful bear hugs without any ill effects, even breaking free from them by knocking the Olympian down with incredible strength. Kratos was ultimately able to defeat Hercules, proving to be the superior warrior of the two. Kratos ripped off Helios' head, using only his sheer strength, and is able to rip in half Undead Legionnaires, using only his hands. It is presumed Kratos was born with his god-like strength and abilites due to being Zeus' demigod son. He might also be partially immortal and gotten stronger when he absorbed Hades soul.
In addition to his vast strength, he also possesses incredible agility, courage, senses, durability, resilience, and reflexes. He is capable of sensing danger and possesses great skills and accuracy with all forms of weapons and magic. He is also able to regenerate from most wounds at a fast rate, though he didn't regenerate from the scar on his stomach caused by the Blade of Olympus and the scar over his right eye caused by Ares. Due to these abilities, Kratos is able to challenge monsters and even the Gods themselves. Kratos also possesses high resistance to most forms of attack and magic that would easily kill most humans or magical beings.
Before serving Ares, Kratos' main weapon was his sword. Under Ares' rule, Kratos' main weapons became the Blades of Chaos, a gift from Ares as a sign of his servitude. They are essentially two Falchion-like blades on long chains, permanently fused and seared to the wielder's forearms. Once Kratos killed Ares, Athena replaced them with a nearly identical pair of blades called the Blades of Athena, and then replaces them again in God of War III with the very similar Blades of Exile. Kratos displays proficiency with all of his weapons. It's implied that he learned many of his fighting skills from Ares, the former God of War himself. Initially, Kratos also had a massive Spartan army under his command, used both before and during his servitude under Ares.
Kratos, before and after becoming a God, gained many powers from the Gods. When he relinquished his old powers to the Blade of Olympus, he was given new powers by the Titans. Some of these powers resemble the abilities given to him by the Gods. The Blade of Olympus is one of Kratos' greatest weapons, as he has infused all of his godly power into it.
http://godofwar.wikia.com/wiki/Kratos#Weapons_and_Powers
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