Visual Studio Online is now Azure DevOps.
Ranked in these QuestionsQuestion Ranking
Pro Private repositories freely available
Private repositories are free and unlimited for any user.
Pro Continuous integration available
Pro Integrated with Visual Studio IDE
Integrated with the Visual Studio IDE for visualizing on which branch the developer is working currently and visualizes changes not committed yet.
Pro TFS and Git support
Pro Project Management tools (e.g. bug tracking)
Issue management, Task planning, resource planning, scrum
Pro Full enterprise solution
Because it is a full enterprise solution, It does almost everything in the SDLC and it does it well.
Pro Stakeholder accounts are free
Approvers, bug reporters, anyone who doesn't commit code free.
Pro Data encrypted at rest
Most data is encrypted. Microsoft working on getting this to 100%. Handy if you have compliance requirement here
Pro Gated check ins support
You can't approve your own check-ins.
Con Overwhelming complexity
Since it's made to be an enterprise product for large teams and companies, it may be overwhelming for small teams and projects.
The code is proprietary.
Con Limited collaboration features
VSO is built for well-defined teams, not for open-source projects where everyone can collaborate. In order to participate in any way, a user has to be explicitly added to a team.