No worries at all! I battled with that choice for a while when I was self hosting. I had already been so deep into using GitLab CI that it would've been a pain to migrate to Forgejo Actions, though to be fair when I had setup GitLab the Actions system didn't actually exist yet.

And if you plan to expose it to the Internet, GitLab being a much larger project has more potential security issues to keep up with which is another important note.

(Though as always when publicly exposing services to the Internet, keep up with patches either way and stay safe!)