I didnt say it was, but its still an advantage. Superman is still vulnerable to magic and juggs is literally a magic tank.
Even at that, the fight is to ko or incapacitation. Juggernaut can keep fighting even when reduced to a skelleton. So i'd like to see how superman could even KO or incapacitate him. How do you incapacitate an unstopable forcem and i dont think ive seen anyone actually KO juggernaut without Telepathy