Going from the MCU ('cause I really do not know the comics) I would rate Capt. Marvel off the chart but I will accept Thor at the top of the fighter level. Do not think Star Lord is a fighter, neither is Hawkeye. Black Widow is super human but is she better or worse then Capt. America, I dunno, am willing to listen to arguments either way.
On the basis of what we have seen so far in the MCU Thor > Hulk.
So that out of the way I would see the 20th level fighter on the level of Thor + Stormbreaker.
On the basis of what we have seen so far in the MCU Thor > Hulk.
So that out of the way I would see the 20th level fighter on the level of Thor + Stormbreaker.