What's your favorite to-do app?

A native iPhone app is a must, bonus points for Mac and iPad apps. I have already considered Things, OmniFocus, and Reminders.

@aleen Greatly depends on what you’re looking for but I’m currently trying out Craft for this. I like to keep my daily notes and todo stuff together as that’s typically where my todos come from. And Craft 3 has some good new task management stuff in it which includes emailing reminders of unchecked todo items.
@danvpeterson oh, the emailed reminders is a really interesting feature!
@aleen I was surprised by that and actually really dig it!