I just spent a couple weeks comparing Jira, Bugzilla, Fogbugz, and Redmine. I'm at multi-faceted design group doing firmware, desktop software, and silicon design(multiple codebases / documentation), and I wanted a system that will work for everyone, and let me move issues across projects to their root cause. I also wanted it to have email-in support to make sure employees have no excuse to not file an issue.
Fogbugz: likely my favorite from a user-interface standpoint. But I needed project categories, something you can now write a plugin for, but didn't have time to deal with. Their Kiln product looks great, but you may need to check if it's svn/git compatible -- I think it's primarily mercurial.
Redmine: I would've chose this if it was a small group. It's free, open source, lets you create compartmentalize into subprojects probably more than you should. But I had fears of ruby scaling out to a bunch of people. There were also some UI quirks that bugged me (e.g. global search should always be enabled, even in a project), although there's some gorgeous themes coming out for redmine soon.
JIRA: What I ultimately chose. It's definately a "wine of fear", that is an enterprise product with many features thrown in not to offend or lose business. Because of this, you get a fairly boring UI, and can feel bizarrely complex to configure. That said, it works.
Fogbugz: likely my favorite from a user-interface standpoint. But I needed project categories, something you can now write a plugin for, but didn't have time to deal with. Their Kiln product looks great, but you may need to check if it's svn/git compatible -- I think it's primarily mercurial.
Redmine: I would've chose this if it was a small group. It's free, open source, lets you create compartmentalize into subprojects probably more than you should. But I had fears of ruby scaling out to a bunch of people. There were also some UI quirks that bugged me (e.g. global search should always be enabled, even in a project), although there's some gorgeous themes coming out for redmine soon.
JIRA: What I ultimately chose. It's definately a "wine of fear", that is an enterprise product with many features thrown in not to offend or lose business. Because of this, you get a fairly boring UI, and can feel bizarrely complex to configure. That said, it works.