Finding a good productivity system is so much more than the mechanics of whatever tool you use. In fact, almost every tool is more or less the same.
They have due dates, and start dates. You can organize things into projects and sub-folders. Some of them allow collaboration and some don’t. Some follow Agile methods or Kanban or some other productivity methodology.
In many ways, none of those methods matter for you either. No one can tell you that Agile always works because it doesn’t always. If your team hasn’t bought in 100% and doesn’t follow the methods described, then it won’t work for you.