Thor is the strongest Avengers, I mean, the guy is a god!!!! He is physically stronger than any Avenger (not sure about him and Captain Marvel though). He is the god of Thunder. He has the power to control and be charged by lightning, or ‘ambient energy’. Once Thor claimed Stormbreaker, he no longer needed to be worthy to wield power, he simply IS. He now has complete control over his power and all power related to Asgard is now in his command personally.
Although between him and Captain Marvel... I can’t decide who is stronger