Hmm not sure, Superman can be a bit of a pussy at times, I mean he got beat up by a middle aged trucker in Superman 2, lolz.
Thanos with or without an infinity gauntlet fully equipped with all infinity stones?
Their recent respective movies? Absolutely; Superman was written on an entirely different level than the MCU. Comics versions? Thanos is a monster and would bodyslam Superman.
Never heard of thanos? I think superman always wins
You haven’t heard of Thanos? The antagonist of two of the biggest movies in recent years? If I ran into you outside of the internet I might believe that, but considering that’s not the case, that’s extremely hard to believe.