Cardano doesn't have smart contracts yet, and with Metcalfe's Law and network effects, Ethereum is already leading with DeFi.
[1] https://docs.cardano.org/projects/plutus/en/latest/
[2] https://github.com/input-output-hk/plutus
[3] https://docs.cardano.org/en/latest/marlowe/marlowe-explainer...