If you want it to be flexible in terms of look, have widgets, have expandable, removable storage, etc. choose android. Choose iOS if you want the expanded app selection, but the touch interface on iOS kinda blows, imho, for in-car use. Can you get an iOS tablet with real GPS? My wife's got an Ipad 2, and I can see the attraction, but I need my customizability when it comes to in-car apps and interface.