For people who are addicted to writing down tasks and to-do lists, the advent of task manager apps on smartphones and tablets seems heaven-sent. But with tons of apps to choose from, and more arriving everyday, it gets more difficult to pick one and stick with it (until the next shiny thing comes along). Should you go for bells and whistles or minimalism? Do you pick one that’s multi-platform or just stick to one task manager per gadget? Do you stick with your phone’s native to do list app or go explore others?