I've been using Todoist for my daily tasks, but today I decided to upgrade to a Premium account. I used Things for a while, but when I switched to using an Android phone (OnePlus One), I had to switch to something that was cross-platform. Todoist allows me to structure my projects hierarchically and put priorities on the tasks. The Premium account means that I can add labels and comments to the tasks. It integrates with Amazon Alexa, and there are apps for all my devices!