Calendar manages appointments, not tasks. Reminders manages tasks, but I found it lacking when I tried it, and I already had the other ones. I used Due also for a while, but mostly for the timer function because iPad doesn't have a clock app. Now that I have an iPhone with the clock app, I don't need Due any more so I deleted it.
For appointments, I use Helvetical, but that's because of the nice looking interface, it has the same functionalities as Calendar but it looks better.
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