Those in the Bitcoin Cash community have the stance that Bitcoin Cash is the true Bitcoin and that it more appropriately represents the original creator of Bitcoin Satoshi Nakamoto’s vision for Bitcoin.
The idea being that in Satoshi’s original white paper and subsequent forum communications, he meant for Bitcoin to be used more as “peer to peer cash”. Lately, the argument has been made that the original Bitcoin has become too cumbersome to transact in and acts more as a store of value.
Bitcoin Cash with the larger block size and thus quicker transaction time, is able to facilitate “using it” better – according to its fans.
It is up to interpretation if attempting to align with a creator’s vision makes one coin “truer” than the other – especially when the creator is not here to provide insight.