Bitcoin cash is much closer to the original implementation by Satoshi Nakamoto. It's simply a much smaller, and IMO, cleaner codebase that just increased one parameter to achieve scaling.
Bitcoin core (what we call BTC) has many more lines of non-Satoshi code that was added to facilitate off-chain scaling.
Bitcoin core (what we call BTC) has many more lines of non-Satoshi code that was added to facilitate off-chain scaling.