We're moving from GitHub to GitLab
We've been using GitHub for development collaboration over the past five years. It's a great tool (especially for us who remember the CVS days), but GitLab has taken collaboration to another level with their DevOps functionality, and granularity of user permissions is a very useful feature for us, as we often have various developers and vendors jump in and out on projects.
Microsoft's purchase of GitHub was something that did not concern us and was not a factor in our decision.
As we learn more and become familiar with the platform, we'll post about the features.