Bitcoin is undoubtedly one of the best coins on the cryptocurrency market. Bitcoin cash in my opinion is not the worst fork of Bitcoin, but I will not invest in Bitcoin cash.
why don't you try it first to invest in Bitcoin Cash and say you will not invest in it, in my opinion Bitcoin cash has good potential because the coin is from the hard fork of its main coin which is no longer in doubt for long-term investment and will be profitable in the future.
Definitely BTC is much more preferred when compared to the two. In terms of potential, BCH may be a better investment, but we cannot expect a large increase from it unless BTC increases.