Both Asana and Trello support Kanban style project tracking. Trello is Kanban-only project management, knowledge management, actually card-management tools. Asana is much more complex, supports different project management approaches, well integrated and helpful for any style/type project.

We choose Asana finally, but still some projects kept in Trello

Procezo is an excellent free-for-life task managing tool with several benefits. Its clear, user-friendly interface is perfect for small businesses and startups as well as enterprise-level use. It makes it a seamless transition from any other project management tools. Its simple but effective layout allows new users to quickly adapt to its ever-expanding set of features. Procezo allows users to create boards and provide access to users or teams as required, set priority and precedence of the task and allowing for subtasks and discussions to be created. With unlimited tasks, users, projects and free support, Procezo is quickly making its way into businesses from across the world and the ultimate growth hack tool.

I loved Slack. We used it for discussion. But somehow, it was always difficult to get things done. HeySpace is what replaced Slack and Trello as it combines the functionality of both tools.

So, now we keep on discussing as we did on slack, but once we to a point where we want to do something, we create tasks on a board and distribute them.

trello has a much simpler interface and easy to learn for any team member. asana might have more features and configuration options but do you really need a complex system for developers to manage tasks?

After Microsoft took over trello, it has become more restricted these days but still good for startups.

Keep it simple! Focus on your product, not tools.