Android adds a menu button that brings up a menu in any application that is open. This allows powerful and fast access to settings that can only be accessed from separate settings menus on the other platforms. The back and search buttons on both Android and Windows are fantastic for navigation and only take a few hours to get used to.
Oh and that dedicated camera button on Windows? Some Android devices have it and some don't, but it's nice to have a choice.
NEXT: Google Voice