The layout and interaction seems more consistent, and the text editing is less infuriating.
The search interface is always in the same place! Oh, the wonders of technology.
That's actually the benefit of Jira.
It lets you define your own fields and workflows.
Most other apps force a specific workflow which may not work for your specific business reqs.
If you need to do a bunch of crazy, waterfall like, interdependencies and formal planning, Jira is probably still the way to go. If you need a reasonably usable ticketing system, Pivotal is good enough.
Unfuddle was better in most ways, but it's mostly abandoned and they changed their pricing model so it got really expensive for what it is.
Trello with git hooks would be about perfect...
I personally really liked it as a dev.
It's snappy enough, intuitive, handles complexity well...