At the time when I compared to Gogs, I read about a period where the Gogs maintainer was off, and PR's were piling up. Not sure, but that may have been the reason to create Gitea fork at the time. The project has multiple maintainers, and when I compared activity (about 8 months ago), it was more active in terms of PR's and commits.
I run Gitea since the goal there seems to be more like Github while Gogs seems to aim more for a Gitlab-Light experience.