I have at times used then-current versions of Fogbugz and JIRA over the past 15 years, and I remember the dichotomy pretty much like Joel lays it out.
I used Fogbugz on small teams, where we didn't have a dedicated person to do things like administer the bug tracker (and where the programmers chose their own issue tracker). When I saw JIRA, it would usually be because there were a lot of layers of management above the programming team (and a need for lots of reports and charts to go into presentation slides), or because the programmers were offshore and not known personally.
That is just one anecdata point, of course. But I think it was always pretty obvious that the two products had completely different philosophies -- and also that they still did compete to a good extent, because after all they are both issue trackers for software development (at least primarily; I guess JIRA also aspires to track issues building your airplane and whatnot).
If those were the only two bug trackers that existed, I myself would choose JIRA if I had somebody else to set up and run it, and Fobugz if I had to do it myself.
I used Fogbugz on small teams, where we didn't have a dedicated person to do things like administer the bug tracker (and where the programmers chose their own issue tracker). When I saw JIRA, it would usually be because there were a lot of layers of management above the programming team (and a need for lots of reports and charts to go into presentation slides), or because the programmers were offshore and not known personally.
That is just one anecdata point, of course. But I think it was always pretty obvious that the two products had completely different philosophies -- and also that they still did compete to a good extent, because after all they are both issue trackers for software development (at least primarily; I guess JIRA also aspires to track issues building your airplane and whatnot).
If those were the only two bug trackers that existed, I myself would choose JIRA if I had somebody else to set up and run it, and Fobugz if I had to do it myself.