Overview, checkboxes, and multi-level tasks are all covered. When you create a task, you can add instructions, which is helpful for clarifying what needs to be done. When creating sub-tasks, you can add several at once, but if you want to include different details for each sub-task like a different deadline or the person responsible you still need to open each one separately.

It is user friendly, it is clear and easy to understand.

Overview, check-boxes, multi-level tasks. When creating a task you can add instructions. When creating sub-tasks, you can add multiple at once (but if you want to add different details to the sub-tasks like different deadline or person who is to solve it, you already have to open it separately).