Gitlab as A LOT of features that GitHub and Azure DevOps are missing. Even if both GH and Azure are backed by Microsoft, GitLab being open source has a faster upgrade rate and the hosted by gitlab.com solution seems more appealing than anything else! Quick win: the UI is way better and the Pipeline is way easier to setup on GitLab!
Never tried Gitlab. This might change my mind
Is GitLab the only tool which provides free CI or we have others as well ?
Bitbucket offers only 50 minutes/month for free (500 minutes/month through June 30, 2020).
Github (Actions) offers 2000 minutes/month for free.
Gitlab offers 2000 minutes/month for free.