Quite honestly, I think BTC and ETH are overrated. Why ? Because their blockchain keeps every transaction and permits tracking of anything that happened to any account. In other words : they bring pseudonimity, not anonymity. What makes the value of cryptocurrencies is, in my opinion, centrally their ability to fly under fiscal radars. With that in mind, I think a fungible cryptocurrency is way to go. I do not trust ZCash for technical reasons. In "big names", the reasonable option seems to be Monero. Not sure if combining Monero's cryptonote protocol with ETH transactions is possible or on the way. That combination would make me abandon any other cryptocur _in the hour_. Until someone brings that to me, I use fungible Monero. And I think that, especially here, my arguments have some sense.