When comparing FogBugz vs Fossil, the Slant community recommends FogBugz for most people. In the question“What are the best bug/issue tracking tools for small development teams?” FogBugz is ranked 6th while Fossil is ranked 8th. The most important reason people chose FogBugz is:
EBS produces ship date probability distributions, see [here](http://help.fogcreek.com/7676/evidence-based-scheduling-ebs).
Ranked in these QuestionsQuestion Ranking
Pro Evidence-Based Scheduling
EBS produces ship date probability distributions, see here.
Pro Backed by big company
The same company behind Stack Overflow and Trello.
Pro Intuitive UI
The UI is very well thought through. All the right stuff is in the right places.
Pro DSCM + issue tracker + wiki
If you need a (distrubuted) SCM, Fossil comes with a built-in SCM, a wiki and issue tracker.
Pro Self-contained file
The data is stored in one single file. No file structure distributed over a bunch of folders.
Pro Multi platform
The executable is provided for multiple platforms, e.g. Linux, macOS, Windows.
Pro Easy to install
The Fossil application contains one single file. No need to install dependencies.
Con Cannot be used without an account
You cannot show someone a ticket that does not have an account.
Con Ticket comments can't be edited
While a ticket can have multiple comments added to it, and (separately) also attachments — if the users have the right permissions — it is impossible to edit a comment after submitting it. This is probably why a comment must be previewed before it can be submitted.