The ability to have arbitrarily deep nesting along with the efficient and information-dense visual organization make this look pretty interesting.
Trello is just too simple to capture the complexity in any project of reasonable size, and JIRA is a maze where you really have to know what you're looking for.
We have been using Plectica[1] to plan together and keep track of progress. It's not perfect, and sometimes it's actually too flexible, but in the end has really worked for us.
I used Trello to manage my projects, but a few months ago, I discovered Quire. It's pretty easy to use and it has a list view. Which is great for my teams to dump ideas, and i can moved them to board afterward for tracking the project's progress.
One of the best task management app I've ever used. Not a fan of their theme choice though but overall, it helps me with my work. Simple enough to not create any confusions.
Trello is just too simple to capture the complexity in any project of reasonable size, and JIRA is a maze where you really have to know what you're looking for.
We have been using Plectica[1] to plan together and keep track of progress. It's not perfect, and sometimes it's actually too flexible, but in the end has really worked for us.
[1]: https://plectica.com/welcome/technologists