I was a fan of Wunderlist until MS scooped them up and churned out To-do.
I ended up moving to Google Notes. I mainly use the widget as a way to keep myself reminded of things I want to do (with no deadline). My GF and I share a note for Groceries which works well.
Too little to late 4 me sry MS. Lack of alphabetically sorting my list was enough for me to switch.