Monero and dash both have fairly good privacy built into the protocol [1] [2], although monero suffers from large transaction sizes and dash suffers from centralization as a result of this.
[1] https://en.wikipedia.org/wiki/Monero_(cryptocurrency)#Privac...
[2] https://en.wikipedia.org/wiki/Dash_(cryptocurrency)#PrivateS...
Disclaimer: I have no monero or dash, but I do have various other cryptocurrencies.