Protected custom settings and protected custom metadata types both securely store sensitive data, but they differ in their security posture and manageability:
- **Protected Custom Settings**:
- Legacy solution without built-in graphical user interfaces (GUIs) for management.
- Requires custom code to update settings.
- Suitable for programmatically accessed secrets and restricted to the managed package's namespace.
- **Protected Custom Metadata Types**:
- Modern, preferred approach with better manageability and packaging.
- Can securely store subscriber-owned secrets.
- More versatile for deployment, updates, and metadata-driven configurations.
- Integrates well with metadata API operations, making it ideal for frequent updates.
In summary, protected custom metadata types offer a more robust and flexible security posture compared to protected custom settings.