I need semi-offline To-Do manager with web-interface for ordinary work and Android app to edit lists "on the go". Syncronisation required.
Producteev has only iPhone app or web-interface. Out of competition.
The main intrigue is between two competitors: gTasks and Wunderlist. Wunderlist looks smarter, has shared lists to allow my wife control purchase list. But this app has not really working options to set only manual syncronisation and to reorder tasks at list manually. GTasks, on other hand, has a minimalistic interface, have not shared lists, or I failed to locate them, but it has manual syncronisation and task ordering options.
It seems complex, but I use both competitors: Wunderlist to control home purchases list and GTasks to control other tasks.