Due’s great. I use it for reminders as well as noisy, repeatable alerts I might not hear from the comparatively anemic alerts in Reminders and Todoist. We’ve discussed the app here a number of times, including here and here.
Todoist is in the process of reinvention by the developer - they’re adding Trello-like boards later in the year, among other things. It’s a very usable app but no beauty. For me one of the biggest advantages is the 2-way calendar sync with Google Calendar (which is available even in the free version of Todoist); with it I can schedule something and within seconds have it appear as a Todoist calendar event in Google Calendar, but I can also be in the calendar and move things around and they immediately sync back to Todoist itself. (If you normally use Apple Calendar [or Outlook] you can always create a free GC calendar account for yourself then subscribe to it in Apple Calendar and the 2-way sync will still work.)