I'm holding ETH and ZenCash only, as Ethereum is probably going to be the most used Cryptocurrency ever and ZenCash because it's totally underrated, has the best privacy features (zero-knowledge proofs are far better than ringsignatures or mixing) and other features, like private messages, more than 7000 nodes and are working on anonymous publishing of files and scaling with one of the best R&D firms at their side (IOHK). Even during the Bitcoin drop ZenCash was pretty damn stable.