I have used Wunderlist for about 5 years, but now its being retired. I tested and tried 10+ apps since then, and none were that great. I stumbled upon TickTick, and wish I had started using it years ago. TickTick has much greater customization options, and does a great job of incentivizing completion of tasks via feedback. It has made my life much easier. I do wish the widget had options to change how it appears, the "to dos" do not have breaks between them.