Bitcoin Cash, Bitcoin SV, Ethereum Classic, Monero Classic all of them tried to create a better cryptocurrency. The promoters took the old code, changed some parameters, and told that "their" version is better. But, it is their version and not the version made by the community. That is what matters in cryptocurrencies - vox populi.
That's certainly true, mate. Despite these cryptocurrencies' deviation from their predecessor's original roadmap, some are becoming quite unique in the crypto/Blockchain space. Compared to their predecessors, newly-forked Blockchain networks have taken a different approach of the projects' development. For instance, both Bitcoin Cash and Bitcoin SV aim to scale the Blockchain at a different way than the original Bitcoin (BTC). Their on-chain scaling approach by increasing the block size, eliminates the need to develop an independent layer for "off-chain" transactions. It's simplistic as less work and effort are involved in scaling the Blockchain. Whenever this is the ideal way for scaling Bitcoin or not, it's yet to be seen. Some say that Bitcoin Cash and Bitcoin SV will become extremely centralized in the long run, because a bigger block size reduces node operators' level of accessibility. This translates to higher bandwidth and storage requirements, where the average person cannot afford running a BCH or BSV node. Others say that Bitcoin's "off-chain" scaling solution will introduce KYC/AML into LN nodes, effectively becoming "Banking 2.0". Ultimately, the decision of investing into BCH or not, will totally depend on your perception of scaling Bitcoin.
All in all, Bitcoin Cash has retained its place on the market for quite some time. The cryptocurrency is 3 years old, with a proven track record of development and innovation. Besides that, the project has some prominent developers behind it. With this, Bitcoin Cash may be able to survive for a very long time. If you prefer convenience on top of security, then Bitcoin Cash would be the ideal investment for you. It all depends on a person's preference from one cryptocurrency to the other (either Bitcoin or Bitcoin Cash). I'd choose Bitcoin on top of Bitcoin Cash as it focuses on decentralization/security above all else. Just my opinion