While it is true that Minato has more/better hype and more impressive feats you have to also accept that most characters didn't even see Itachi go all out so he obviously wouldn't get hyped as much. But when characters, like Zetsu, saw his full power they considered him immortal. Minato, as the head of a village, had a lot of time to shine in front of people like Kakashi and Jiraiya whereas those same two people might not even have known that Itachi even HAD Susanoo, let alone the spiritual weapons. When you're a member of a underground criminal organization you obviously have less time to shine than when you're Hokage.
But I'm 50/50 on Itachi vs Minato tbh