When it comes to privacy, monero should be your go-to solution. That's are tried and true. If you want privacy for other blockchains, I definitely recommend checking out the work going on at
incognito.org. They are working on some great solutions to add privacy in a legitimate way.
If I understand correctly this Incognito stuff is neither supporting mainnet Bitcoin nor mainnet Monero, and it has some new shitcoin centralized blockchain with worthless tokens, bridges and other crap like that.
I wouldn't call that privacy at all, especially when there are legitimate options for exchanging coins with atomic swaps or using Bisq exchange.