Bitcoin has three things going for it, the network effect, the strong brand name, and (arguably) the strong security offered by the extreme mining power. Except for that, there is nothing Bitcoin can do that other cryptos cannot do better.
Bitcoin Cash ... well, it may score a bit on brand name recognition, and Bitcoin Cash is much more Bitcoin than any other altcoins with "Bitcoin" in their name. It doesn't have the network effect (though it may be a bit simpler for the industry to support Bitcoin Cash than to support other altcoins). It doesn't have much security in the mining - while it would be quite expensive to perform a 51%-attack, it is fully possible.
From this perspective Bitcoin Cash is just yet another altcoin - as I see it, it doesn't have any real value proposition.
That said, Bitcoin Cash can be a worthy competitor with Litecoin.
Thank you very much!