There are loads of project management tools out there for people to use. Simple question really - what is your tool of choice and why? How does it improve your workflow?
+1 on Trello. I always go with this for small teams. Single board for a project. It's very simple + integrates with everything. I like how it doesn't force on you how to use it. Can adjust to whatever works best for your team.
I like Asana becuase it's checklist based and less visually drag-and-drop. It works better for my particular style, and adding things like instagantt makes it even better.