The reason why I chose Todoist as my to-do app is how easy it is to add quick tasks both on PC and on Android. I also picked it over other apps for its fast sync with Google Calendar, that lets me create a fast and efficient way to gather and organize tasks.
Something that I would add is the ability to set the task on "in progress".
Super user freidnly, neat and clear interface with good and necessary features. However, would be perfect to be able to collaborate with other accounts.