Bitcoin Cash is a fork of the Bitcoin protocol that improves upon the Bitcoin protocol by increasing the block size which allows more transactions being able to be transacted at a lower fee compared to Bitcoin. The big downside is that the community has clearly chosen to stick with Bitcoin as the true store of value based on hash rate and Bitcoin Cash will not be the primary means of exchange in crypto since the value of the coin is not stable. I would recommend investing in Bitcoin instead of Bitcoin Cash if you are looking to invest in a crypto store of value.