My next choice for writing tasks down was #AnyDo. I don't know why. Actually, after a couple of days I've sadly found that the app is too slow and #UI requires too many taps to make or edit a task. And I don't understand the feature of its calendar that is actually isn't independent, but just a way to browse a system calendar - why for?
My current choice is #Habitica. Some time ago I didn't catch it's point and removed it after a few days of using because gamification required additional efforts like managing game progress and setting complexity of tasks... Now I have read the wiki of Habitica and understand some key points. #Gamification actually shouldn't be the attempt to make tasks management a game. The app just helps manage tasks with more fun and motivation, but it's still first of all a #taskmanagement app.