The only two that I find remotely worth using are XMR (Monero) and ZEC (ZCash). ZCash is harder to use, and you have to go out of your way to use a private address (if your address starts with T, it's transparent & not private), but assuming you're not leaking your IP address, zk-SNARKs are uncrackable.

Monero is the only one that's distributed, decentralized, open source, and fairly launched. Its development team is entirely volunteer, and it uses multiple simultaneous privacy protection methods. It's also always-on privacy, not opt-in. It's what I would personally use.

Stratis will release the 18th of december the Breeze wallet with Tumblebit.

With the beeze wallet you can trade bitcoin anonymously!

I choose Monero, and still believe that XMR price is too low and will grow in future.
Monero has an excellent community, I joined local Monero channel in telegram a few years ago and read it almost every day.

Much useful news, calm communication and very friendly participants.
And I like the Monero idea of course.