Bitcoin cash is a hard-fork of bitcoin around the highs of Bitcoin in 2017 to somehow slow the speed at which Bitcoin was moving. Currently, Bitcoincash or BCH is at the rank of 13 in the coinmarketcap ranking, with it's current price at $464.81. ETH has been in the system for a while now, since 2015 it was released has arrived to be within the top 5 altcoins and is currently in the 2nd position is coinmarketcap, with a price of $1,936.98.
To me, ETH will have more value and use to the crypto space than BCH when the ETH 2.0 is realised.