After the ethereum hard fork, Ethereum mining became profitable than Zcash mining. Below is the current profitability for both Ethereum and ZCash.
I've a mix rig of different branded GTX 1070 and on an average I'm getting 30MH/s on Ethereum and 400Sol/s in ZCash Mining. Both of the mining is consuming around 770 watts.
If I do the calculation then the following result comes.
On current difficulty and price, ETH mining will give me $8.43 net income and ZCash will give me around $7.88 net income. But in terms of coin, I'll get less coin in ETH and it's about 0.328ETH and in the other hand in ZCash I will get 0.0430 ZEC coins.
So, if the future value of ZCash becomes higher than Ethereum price then mining ZCash and holding it will be more profitable. So, now it's upto you which of the coin will you mine.