Who wins?
Mugen vs Jin vs Guts vs Griffith
Guts vs Griffith wins 83% to 17%. 27 more put them in the same row. From Anime Rivalries Tier List. Pick a side.
ZachRates on Mugen vs Jin: they swear to kill each other and become best friends instead
throwaway19312 on Guts vs Griffith: friendship to the Eclipse. the darkest rivalry ever written
Anime Rivalries Tier List: the full ranking