Back on topic:
"So I am wondering what you guys think set android tablets apart."
The ability to customize your own UI is a HUGE part of the reason I avoid iOS.
It's not simply access to widgets either (although some widgets are AWESOME).
As someone else said above, it quickly gets boring when you're forced to be either inside an app or staring at page after page of app icons always in the exact same formation and virtually the only thing you can do to customize the look of your device is change the background that gets covered up by your app icons anyway.
If you happen to like that UI setup, you can emulate it almost exactly in Android. If you don't, then you can make some pretty drastic changes to it if you want.
For example:
- you can make your tablet home screen look like OSX.
Obviously, being able to modify the UI isn't the end-all-be-all of the prime's advantages over the iPad2 though. There are also several other things to consider such as:
The prime has upgradable/removable storage with it's microSD card slot and also supports both standard SD and USB storage with the dock. This can be a big deal if you're traveling and won't have internet access. (Though you can get around this limitation by using an SD card adapter or a WIFI enabled storage device with the iPad2, it's generally a lot more expensive.)
The micro-hdmi port is also awesome; though again, you can get the same functionality from your iPad2 by buying a special $40 adapter cable.
Another thing that I would consider to be an advantage for the Prime is the modding community. It's quite possible that you will be able to not only install Windows 8 on your Prime, but dual boot between Android and Windows if you like. That's just not something that will happen with Apple hardware... ever. And just like UI customization, it helps to keep your experience with the device fresh which encourages active use after the initial "wow factor" wears off.
FLASH (though considerably less important now that adobe has canned flash development for mobile browsing)
And last but not least, with the Prime, you don't have to install that massive bloatware that is iTunes.