i think monero is the best and maybe XVG would come in second? but governments will have a big headache about this type of coins existing and they will try to stop its operation.
And thats the beauty of these coins. Until people would give these token a value, there's no way for governments to crack it down. They can stop it's trading on some centralized exchanges but with the growth of decentralized p2p trading, we are into the new era of cryptocoins now.