A: Mostly enterprise-readiness and features.
- Single-Sign-On (SSO) for Azure, AWS and Okta.
- Encrypt Files and Documents with any file type.
- More options while generating a secret.
- On-Prem version possible of password.link.
- API
- Using CryptoAPI for encryption

As far as I know you also cannot request a secret there.
There may be more (or less) - you may check yourself also.