We have been using Trac for couple of years and until recently it suited our needs just fine.
But with move to Git version control system I started to look for something else. Although Trac supports Git: there is a plugin for it, but I have failed to install it when I tried that year or so ago. It needed different Python version than we had on our development server. According to Trac website the plugin is working ok, so there is no need to abandon Trac if you are happy with it.