Assembla for severals years ago (8+), and always feel confortable with the integrated enviroment, you can setup a version control system for your project, but also it provides issue tracking for your team , with cardboards to follow stages and integrated tools for code reviews and code browsing in the same app.

The ease of planning sprints, categorizing them, assigning them, scheduling and the like is what makes this an easy product to use. You can configure the views how you wish with shared views and personal views of just the tickets you want to see. It doesn't force "its view of the world on you", you get to choose. Ticket views also update in real-time.

linking of git activity to tickets, and various other services linking together, is very handy