If you mean GnuPG, that is what Snowden used. It could be better than new software that may have new bugs. Memory safety is a very small part of cryptographic safety.
(New cryptographic software can also be developed by all sorts of people. In this case I'm not familiar, but we do know that GnuPG worked for the highest profile case imaginable.)
GPG works great if you use it to encrypt and decrypt emails manually as the authors intended. The PGP/GPG algorithms were never intended for use in APIs or web interfaces.
Ironically, it was the urge not to roll your own cryptography that got people caught in GPG-related security vulnerabilities.