Bitcoin cash is a peer to peer electronic cash that actually meets the vision that Satoshi Nakamoto wrote about in his white paper. This can be found here https://bitcoin.org/bitcoin.pdf.
The reason why bitcoin is so valuable is because of its potential utility in the future to become the new monetary system. This is not possible with the extremely high fees and slow transaction times that are being seen on the bitcoin core network. The lightning network has done nothing to ease congestion. Bitcoin cash has low transaction fees and quick transaction times allowing you to send small amounts of money for a small fee whereas on the bitcoin network you would be lucky to pay below 30 dollars in fees to use your bitcoin.
I bought into bitcoin envisioning a future where everyone uses bitcoin instead of fiat. Sadly now that is not possible with bitcoin but it is possible with bitcoin cash. With a strong community behind it Bitcoin Cash is being adopted by more and more retailers and it is actually making me excited about the future again.