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Tablets are extensions of smartphones and that means getting lots of notifications. Android led the pack from the beginning with a notification center that slides down from the top top inform users of messages from many apps.
Apple finally implemented a notification center a while back, and while falling short of Android's it's still pretty good.
Windows 8 has live tiles on the start screen and while those can be useful they fall short of having one single place you can go to see all of the important notifications. There's an attempt to do this for social media in the Metro People app but it's not comparable to the notification centers on the iPad or Android tablets.
You either love widgets on Android or you hate them but they can be very useful. They can provide useful information on the Android home screen, and apps can have their own widgets to use as desired.
Neither iOS nor Windows 8 has widgets and both could benefit from having them. Sure, Windows 8 has live tiles which are sort of like widgets, but they fall short.
Tablets are extensions of smartphones and as such they are good for listening to music or watching videos. That means using headphones, especially in public areas, and that's an area that Windows tablets fall short compared to the iPad and Android tablets.
Headphone use is ingrained in Android and iOS. Just plug in the headphones and listen to what's playing. Some Android tablets even sense when the headphones are plugged in and offer special home screens to facilitate listening (see image above).
Windows tablets usually handle headphones, but sometimes they don't. I've had tablets fail to play audio at all with headphones plugged in, and even one that played audio at such a low volume I couldn't hear it.
That volume problem was rectified by troubleshooting online and then finding a device driver that resolved the problem. That's something never necessary with Android or the iPad. It's the price of Windows 8 tablets being full PCs.