Much more private than lightning, offline transmission, you can use SMS NFC or bluetooth to send ecash, instant settlement (requires no lightning network path routing), very low fees and Cashu is fully interoperable with lightning.
Trade off is that the users are trusting a mint to act as your custodian, but if you need privacy or if you're in an area with spotty internet access (like Cuba) then Cashu will work.
You can check out CubaBTC on twitter for real world examples of how the offline functionality is particularly useful for them.