When comparing Trab vs FogBugz, 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 Trab is ranked 13th. 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
Integrates directly with various services to post issues from your end users.
Free and affordable plans are available.
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.
Documentation is scarce at the moment as the product is still young.
Con Cannot be used without an account
You cannot show someone a ticket that does not have an account.