Bitcoin only

Fully Air-gapped (optional)

NFC (optional)

Plausible deniability (1 seed - infinite wallets by changing passphrase )

Looks cool ( not high on the list , but still a reason)

Coldcard accept Bitcoin for payment

Coldcard seem to be innovating constantly

Coldcard Docs are excellent

I couldn't even mention all of it's features on here to be honest, it's a swiss army knife.