Monero. It's the largest 'privacy coin'. I think I could make a strong investment case for it. I'll say this instead; Don't buy it unless you think privacy's important. It's the most (crypto) nerdy coin, with a technical community (r/Monero). I like to call it cypherpunk money.
As it's private it could get banned -- which could set in back in the short-term. In the long-term, I think it's going to be money (or something like it). It could be a rocky ride!
Edit: A rocky ride with consequences (It's not a fairground ride). I want to point that out.
Edit2: You could sell your investment, obviously. I talking about if you're in for the duration.
https://blockchain.works-hub.com/blog/XRP-We-Will-Persuade-t...