Company I work at uses VSTS and we're happy with it. It's actually a much larger product than just code hosting, as it also includes loads of other things like Agile Planning tools, Build system (which is now much simpler than the crazy old TFS XAML based TeamBuild. Although you only get an allocation of build "minutes" every month) and Release Management (OctopusDeploy style system). You can do cool things around PRs, like enforcing that certain users, or groups of users must approve to be mergable, or that a certain build off that branch must succeed to be mergeable. All this stuff is possibe obviously in GitHub, it's just a bit more integrated. Worth checking out