When comparing GPG / PGP vs Keywhiz, the Slant community recommends Keywhiz for most people. In the question“What are the best tools for managing secrets (tokens, keys, passwords)?” Keywhiz is ranked 9th while GPG / PGP is ranked 13th. The most important reason people chose Keywhiz is:
Keywhiz supports versioning secrets through its admin UI or CLI utilities.
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Pros
Pro Can share secrets among the trusted team
It's possible to encrypt with multiple public keys with very little overhead. So anybody who is in possession of one of the keys on the trusted list can decrypt the secrets.
Pro Complete control over secrets
No unencrypted data ever leaves your possession.
Pro Versioning support
Keywhiz supports versioning secrets through its admin UI or CLI utilities.
Cons
Con Need to understand basics of public key cryptography to set it up right
Con Have to do everything yourself
Con No nice interface and browser integration like other tools provide
Con Still in alpha stage
Keywhiz is still in a very early stage of its development and may not be ready for production yet since it's prone to changes and may have some security issues.