couldn't tell you, never used either.
well, that's not entirely true. i self host Forgejo and Woodpecker, which i think (might be wrong here, especially because Forgejo does have its own CI/CD now) is what Codeberg offers. anyway, it's been OK for the automatic deployments of my little projects. pipeline configuration was flexible and straightforward enough to surprise me in a good way.
are these purists who have never heard of Proton here in the room with us, OP?