Encrypt email or create PGP Zip

Good day,

We are evaluating PGP desktop Email encryption to comply with clients security requirements. Our usage is commonly encrypting files/folders containing personal data (hence the requirement for encryption) and send this encrypted data in an email.

What should be the default procedure:

- Use Outlook Sign and Encrypt buttons then create new emails as usual with attachments

- Create PGP Zip Archive, send them via email (Sign and Encrypt via Outlook buttons on top of that?)

I am not sure what is the most secure method, but using Outlook buttons seems far easier.

Thanks.