1) The bugtracker screenshots shows data that end-users can relate to. If you see a screenshot with states, buttons and text that is similar to what you need, it feels comfortable. There are fewer things to check, than if the screenshot doesn't show anything that relates to what you want the software to do.
2) Integration with your existing tools. Things are much easier when things are integrated, right?
However, sometimes we need to make a choice, between what is right to do, and what is easy to do. If you can save 100 mandays by investing 10 mandays, it becomes a no-brainer. Well, if you can convince yourself, that the most tempting screenshot does not represent the right solution. It also requires that you know the alternatives, and most software developers never heard about process management tools like Joget or Bonita.
We have a list of possible tools to choose between, but we have not decided, yet. If you know good process management and production planning tools that make Bugzilla, Jira, Mantis, Team Foundation Server and Redmine look old, leave a comment.