In my experience bitcoin cash is a fork of bitcoin even BCH is faster and cheaper to use due to larger blocks but still it'a seen that most of the people are using BTC than BCH so why is bitcoin doing better than bitcoin cash?
I think Bitcoin cash mining mostly centralised by Bitmain or few other centralised players. And its future is mostly uncertain. And it is having more forks than Bitcoin and many other problems involved in Bitcoin cash compared with Bitcoin.