Currently it's Captain America. It goes without question that he's the most respected hero of the Marvel Universe, even outside the US he EMAs to be trusted and well thought of and Hickman's Infinity showed him getting respect on an intergalactic scale.
Up until the 80s or 90s I'd say Reed Richards was the most respected hero. He was always the one the other heroes deferred to when there was a big team up.
I'd also echo Spider-Man. Other heroes may act like they don't due to his self effacing humour but most of them seem to respect him and vast and varied experience. His weak spot is public perception though.