I actually prefer Zencash over Monero and Zcash. I think the secure nodes gives them a platform to do some really interesting things, such as secure publishing. It only cost a fraction of the cost of Monero and Zcash too. The team seems to be making great progress. The improvements from the sapling release of Zcash should really help Zencash this year too. I expect all three to do well this year.

I think Spectrecoin will be the best PoS privacy coin if they pull off the stealth staking and ring signatures for all transactions by default. Another compelling feature, is the wallet will connect to the network even China and Russia due to its Tor implementation. A lot of potential.

Zcoin is worth have a couple of due to its untrusted setup vs Zcash and Zencash. They seem to be making steady progress as well. If you are a whale, they recently implemented masternodes, so you could make some passive income off of that if you believe in the project.

I was hoping QRL would have privacy features since they focus so heavily on security, but they recently stated they will not have any form of anon tech at least when launched. Too bad, as it could have been an interesting one.