Cash is private, uncensorable - but not digital

Digital fiat is digital(duh) - but censorable and not private

Monero is private, uncensorable, and digital

Fiat issuance is centralized, unpredictable, and doesn't require PoW

Monero issuance is decentralized, predictable, and requires PoW

Things cash does worse or can't do at all:

-Can't use it to transact instantly with anyone on the planet.

-Can't carry arbitrarily large amounts.

-Vulnerable to confiscation and theft.

-More difficult to verify authenticity on-the-fly.

-Not as easily divisible (Need to carry specific denominations and change)

-Can't trustlessly exchange for crypto (no atomic swaps)

-Can't have multiple people with simultaneous ownership and control over the same cash (multisig)

Lots of differences