You cannot trust corporate "end-to-end" encryption, it often is marketing language without any basis in software. So GPG (PGP) is the only current choice to be

You cannot trust corporate "end-to-end" encryption, it often is marketing language without any basis in software. So GPG (PGP) is the only current choice to be "reasonably secure". That means if you make no mistake and your counterparties make no mistakes, then you can communicate relatively safely about medium-sensitive things online. Absolute security, however, requires a one time pad, and if you desire it you had better use a medium with a smaller attack surface [than the Internet].