Zencash is my favorite play on privacy at this point. The partnership with IOHK is evidence to me that the team is qualified, has been properly vetted, and has the proper roadmap to achieved mass adoption.
A fully vertically integrated privacy system is what Zencash is pursuing. It makes sense when you think about it. What good is a privacy coin when you cannot communicate in private?
Say, for example, you want to keep a transaction private from prying eyes (because it's your right to have privacy). First, you have to identify a party willing to take the other side of the trade (buyer/seller), communicate the terms of the deal, and then execute the deal.
So far it seems the privacy tokens are only focused on maintaining privacy in the execution portion of the transaction. This leaves the information vulnerable to prying eyes in the first two phases (identifying someone to deal with and communicating the terms). ZenCash is working to solve this. Super bullish on this forward thinking team! Good on you for highlighting!