Is ZEC more profitable than ETH?
You can use calculators like cryptocompare (dot) com to see the actual difference between mining ETH, ETC and ZEC. But don't forget that ZEC mining uses less electricity (at the moment).
And don't forget that despite of the ZEC price is going down, the block reward (mining reward) is increasing till the end of November. And also the miner software's performance is enchancing day by day. Thanks to Claymore : )