From https://kinsta.com/blog/gitlab-vs-github/
Github was launched in 2008, and bought by Microsoft in 2018
GitLab was launched as open source in 2011 by two Ukranians
83% of StackOverFlow poll respondants use GitHub
37% use GitLab
Github offers more, including 374 free apps in its marketplace
GitLab is a more complete, internally integrated platform, but supports integration with external packages including Asana, Jira, MS Teams, Slack, Gmail, and others
Github recomended workflow focusses on one-stage review and thus more rapid deployment of the main branch
GitLab recommended workflow involves several layers of review
The markdown synataxes ( GFM and GLFM ) are slightly different.