I think I would agree with you. The other big name seems to be Kill La Kill and while I agree that it's a great revenge anime, Oshi No Ko nails the subtleties of revenge. It's way more nuanced and realistic.
It has been a while since I watched it so I'm not really sure how well it holds up but I remember 91 Days being pretty dope. It's a mafia story about MC infiltrating a group responsible for the death of his family, set during the prohibition era in the US. It's a short watch (12 episodes or so) too.