Eh, for the purpose of this thread and to all Japanese reading, it counts~
...As for the question... I know next to nothing about both of them, but I'll pick Avatar. It's the one I know the least little about out of those two.
Would you rather bring to talk to each other... Bakugou (MHA) and Tanya Degurechaff (Saga of Tanya the Evil) OR Shoto (MHA) and Zuko (Avatar: The Last Airbender)
(in other words, witness two angry kids yell at each other or two calm guys talking about shared experiences/similarities)