I think DC had the first super team in All-Star Comics - JSA.
Marvel had the first superhero rivalry - Torch/Namor in Marvel Mystery Comics.
Or am I wrong?
I think DC had the first super team in All-Star Comics - JSA.
Marvel had the first superhero rivalry - Torch/Namor in Marvel Mystery Comics.
Or am I wrong?
No, you're right.
And I believe Fawcett had the first crossover, when Captain Marvel's fight with Captain Nazi in Whiz Comics spilled over into Master Comics (and created Captain Marvel Jr.).