I'm a user of both - Github for OSS, and Azure DevOps for private work. IMO, these areas are where they are best suited - pipelines in particular are really powerful in Azure DevOps, and user/permission management, AAD integration and integration with build agents are all excellent.
I really like Azure DevOps, but all this has me worried about it's future - do you know if it's going to continue to exist and be developed in tandem with Github?