Best rivalries of the 90’s - Ryu and Ken

Ryu Hoshi was the main character in Street Fighter 2 and Ken Masters was his best friend. They compete since they met each other at Gouken’s dojo.
If you grew up in the 90s you know that in many cartoons, comics and videogames there was an intense rivalry between two main characters. Every kid had his own favorite character back then, so which one was yours?