Well the thing is as well that we're all humans, so all is relative to us. Each individual is so different that will measure differently.
So I think we need to create new content because is a contest, no old projects with years of development, because that's unfair with the others.
A ToDo list will do, you can use databases, arrays, json, objects, lists, anything for the backend. That will not be the main discussion here.
The thing is the UI, again, show us a compilable project, source code required. Each user can test all the projects and vote, and say why he/she chooses that project. If because the keyboard shortcut is nice, if because it uses material design, if because it uses native controls, if because it's minimalist, if because it uses fancy gradients and so on. No one can tell why you choose that app. Is not a decision by some, but all the users that want to take the time to build and test all the apps.
Mabe we get 10 apps with too much luck.