Really do not get the arguments about who the strongest avatar is. Like, the answer is clearly Szeto. Dude canonically worked as court bureaucrat, meaning he not only mastered the four elements but on top of that also administrative law. Administrative law. This is a man to fear.
Wait I just realised this makes a scene like this possible:
Zuko: I really want to pass this law but that one nobleman on the council keeps blocking me and I know no way around him
Aang: *Enters avatar state*
Aang: So actually there are 3 ways on how to make this work legally4 ways if he wants to channel Kyoshi and cut that nobleman’s district in half while making a new island.