S’ym is one of the strongest Marvel characters when it comes to physical strength. He humiliated Colossus and went on to crush Wolverine. Well, I’m pretty sure that he wouldn’t fare quite so well against Thanos. Thanos is very powerful as well and I believe that he could overpower S’ym with brute strength. That’s not even counting all of Thanos’ other abilities. He’s definitely a force to be reckoned with. Thanos wins.