I wish they had an actual feature comparison list. I've been trying to find anyone who can give me a list of non-trivial differences between the two; so far it's always either FUD about Gitea's governance and security structure or ForgeFed. The former has made me rather wary of the project[0] and the latter has been stagnate for years and I'm no longer convinced anything will come from it. Otherwise it's just silence.

Personally I thought Forgejo was doing better work on their actions runner for a while from casual changelog browsing but Gitea's been putting a lot of work into theirs. Otherwise it mostly still looks like a soft-fork in practice to me.

[0] Not that I'm thrilled with Gitea's semi-open-core setup and company but they make it seem like they're kicking puppies and dangling features over non-enterprise users head before snatching them away.