Ethereum is already a mature produce with $millions spent on development. Z.cash is immature and not yet ready for prime time. Ethereum's price and market cap are going up and now #2 market cap.
If you compare between Ethereum and Zcash then Ethereum is sure to win in all features.
Zcash is still new and its development is still learning, one clan with Zcash, Zclassic, and that is the coin I hold now.