It will obviously be ethereum. Bitcoin cash is a scammy coin which is mostly centralized by two people who want to control the way bitcoin works. These two people are Roger Ver and Jihan Wu and if you look closely you'll see them pumping and dumping bitcoin cash all the time. Their goal is to make more money and control bitcoin.

Ethereum on the other hand is run by Vitalik Buterin and has more ambitious goals. Ethereum is also much better in terms of technology because it has smart contracts.

You could have found this out by doing a google search.