Fossil vs GitHub Enterprise

We are using a Bitbucket server, and due to migration efforts and new Atlassian community license changes, we need to move to a new self-hosted solution. The new data-center license for Atlassian, available in February, will be community provisioned (free). Along with that community license, other technologies will be coming with it (Crucible, Confluence, and Jira). Is there value in a paid-for license to get the GitHub Enterprise? Are the tools that come with it worth the cost?

I know it is about $20 per 10 seats, and we have about 300 users. Have other convertees to Microsoft's tools found it easy to do a migration? Is the toolset that much more beneficial to the free suite that one can get from Atlassian?

So far, free seems to be the winner, and the familiarization with Atlassian implementation and maintenance is understood. Going to GitHub, are there any distinct challenges to be found or any perks to be attained?

These are pretty competitive, and to recommend one over the other would require understanding your usage. Also, what other tools you use: for instance, what do you use for Issue-tracking, or for build pipelines. In your case, since you are already using Bitbucket, the question would be: do you have any current pain-points? And, on the other hand, do you already use Atlassian's JIRA, where you'd benefit from the tight integration? So, though I would not recommend one over the other just in general,. But, if Bitbucket fulfills your current use-cases, then there seems to be little motivation to move.