Monero is great, and everyone should have some! The big 3 are: Monero, Haven Protocol, and Secret Network. Just to be clear, Secret Network is not private by default, it is a Cosmos-based chain that has a public L1 for standard transactions, but their DeFi takes place on another layer, where your activities and transactions are private.

The next big one is Haven, because it introduces private stablecoins for the first time, that is going to be huge once folks start hearing about it. And the built-in exchnage in the wallet protects them from exchange bans too.