The biggest point is that there are few apps optimized for Android tablets and even those optimized for Tegra 3 tablets run much smoother and faster on an Ipad. This guy shows them side by side and the difference is huge. Also, web browsing feels better on an Ipad because websites are often Ipad optimized and its better aspect ratio and smoother browser help too.
Of course the guy also said that Ipad 3 is less cool to use than the Ipad2, the UI is outdated and boring, that the notification system sucks etc. etc. Basically apart from apps and browsing Ipad is not too great..It's just that most people use tablets exactly for apps and web browsing and that's where the Ipad does much better.
I think iOS values adding features to iOS more so than switching the UI. How much has OS X changed in the past three, four years? I mean, it's not a good or bad way, it's just their business model. Consumer should decide if they want the features OSX has to offer or if they fall sucker to Windows' constant UI changes from Vista to 7 to 8. I prefer OSX's cleaner, more organized look whether it be the desktop or the menu system. And I haven't found Window's search function to be as good and intuitive as OSX's Spotlight feature, which not only opens applications for me, but has a dictionary within the search (useful when reading either school books or articles online with words I don't know), and individual files such as music. Imagine searching for the song you want to hear, using a shortcut and then typing in the song name and it playing right away. I don't think I can do that natively on Windows.
When it comes to the mobile OS, it's the exact opposite. I feel like Android is more intuitive to search through, I think it's better integrated than iOS. I don't like notifications in iOS. I miss having a smartphone because of how I could see emails and texts all in one place. I know it's more of a chore in iOS 5. I do like the feel of the iPad over most other Android tablets. My TP doesn't count since it's a makeshift Android device. It feels rather clunky and hollow. The iPad feels solid. And I still feel that iOS has a stronger dev scene than Android. I think most blogs would agree that more quality apps are on iOS than Android, or that at least iOS gets them first and they tend to get big there before making their way to Android.
Where Android has the upperhand in hardware, I think iOS has it in software. Sure, it eventually makes it to Android, but I still find holding the iPad and using it to be a bit easier to use when actually using the app. When I use my tablet like I would my laptop, then I feel Android outshines it.