Ranked in these QuestionsQuestion Ranking
Pro Easy to setup
Gitlab pages are quick and simple to setup, with documentation that's short and fast to read through.
Pro Regular updates
GitLab is being constantly worked on and has a new release every month.
Pro Free private repositories
On gitlab.com you can have free private repositories.
Pro Open Source
Unlike BitBucket or GitHub, GitLab itself is Open Source. Even EE (which is needed for pages, but is free on Gitlab.com) is "source available".