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?
Aa for me, bitcoin is better than cash because it could be used as an investment and not just a money to spend. We could have it and gain better as we hold cash. We could have it anytime on our convenience and we could use it for faster transactions.