The NOR type needs to be ultrafast because it is directly connected to the central processing unit of a computer and stores its basic input-output system (the operating system used by the microchip that lies beneath user-interface operating systems, such as Windows).
Android is so far proving relatively popular with tablet manufacturers despite nagging concerns about fragmentation of Android's operating system, user-interface and app store ecosystem.
That's not surprising as it's been among the few where the software giant has controlled "the whole widget" -- choosing the processor, designing the hardware, and developing not only the operating system and userinterface, but a host of licensing standards, services and infrastructure supporting Xbox Live.