Couple issues, from someone who is using both.
1) Screen aspect ratio, as the other guy mentioned. Most HD format is widescreen, so Android lets you use the entire screen for watching video, without cropping. If you watch a lot of movies, this could be a factor. Excellent point
2) the iPad Air 2 gets insane battery life. I charge it like twice a week and I use it daily. It is that good, and I don't know of anything on the Android side of the tablet world that can touch it. :yes:
3) The iPad will have a lot less options than Android. The OS is not much different than it was in 2007. There is no real desktop environment, no widgets or real time data... just an old slab of icons that you can't really customize, that you can manually launch one at a time... If you care about widgets and live email, message, RSS feeds, weather, music, etc... iOS will leave you wanting. It requires you to determine what you want, go find the appropriate app and manually launch them one at a time. Perhaps I have different needs, but I have an app called Launcher that is my shortcut to tons of things. Not built in, put shortcuts to many options, apps, what have you. Not sure what "no real time data" is referring to, but you may be right, depends on what data you are looking for.
4) There is no user file system. Each app has it's own sandbox. If you want a file to be opened in more than one app, you need more than one copy of that file, one for each app. Not completely true. There is an iCloud Drive app now. If you use iCloud, you can find a file (still limited by knowing what app it is "designed" for) and open, send, etc. In addition, you don't need more thane copy. Someone sends you a Word Doc, you can choose to open it in Pages, or Word, or other apps you have installed that support it, provided those apps have implemented Share Sheet functionality. Again, not exactly like on a desktop, but more than most think is available.
5) No simple drag and drop USB functionality. An Advantage of Android is that it is universal, just plug it into a Windows, Linux or MacOS device and it pops up like a thumb drive. Drag and drop all day long, doesn't matter what type of file, no iTunes telling you that you can't transfer that file format, etc...No argument here. Most people think that Apple/iOS relies on iTunes too much, but what it really relies on is the Cloud, specifically iCloud
6) No expanded storage with Apple. You either couple up $100 more for an extra 32GB that cost apple less than $2 to include, or up your data plan and use cloud storage... Many Android devices have MicroSD slots which can be VERY useful for transporting large files, or housing an extensive multimedia library, installing extra apps, etc... Heck, with a $5 OTG cable I can just plug my 3TB external HD in to my phone or tablet and access it just like a PC would...True on the no expandable storage, but the $100 for 32GB more is not accurate. 64 GB is $100 more than 16 GB, and 128 GB is $100 more than the 64 GB. At Apple MSRP. I just picked up a 64 GB iPad Air 2 for $120 off, making it $479 vs MSRP of $599. Semantics? Absolutely, but needed when trying to provide clear, unbiased information to someone looking for it. As far as data on a USB drive, no real way to do that, unless you by a WiFi enabled HD and that company has an app.
7) More customization with Android, if that matters to you. There is NONE on Apple devices. Again, semantics, but not NONE, not nearly as flexible as Android, but not none. Think Mac vs Windows on customization.
8) Apple puts the absolute minimum amount of RAM into their devices as part of their "planned obsolescence" marketing strategy... I had an iPad Mini 2 Retina and had to return it, the 1GB of RAM, not seen in Android in several years, was completely inadequate. Sluggish, constant page reloads when browsing, it just didn't have enough RAM, and as a result the newer features like split screen and multitasking, wouldn't work on it... so that is how they get you to upgrade... I never have bought into this conspiracy theory. Apple products have a much longer "current" status lifespan than their Windows/Android counterparts, as evidenced by a point you make below, their resale value. Apple gets accused of skimping out on specs, but instead builds the OS, and implements limitations on Apps, to provide at least equal, if not better experience wise. As far as older spec'd devices not fully supporting every single new iOS feature, that is true as well, but a 3 year old iPad mini will get updates, can the same be said for any 3 year old Android tablet? Again, possibly a minor point, but the counterpoint to your issue. Also, on older devices? Don't upgrade the OS until the .1 is released. The first release of any iOS upgrade is designed for the current generation and the one about to be announced (i.e. iOS 9 was designed with the iPad Air 2, iPhone 6/6Plus in mind, PLUS the iPad Pro and iPhone 7s/6sPlus that had not been announced yet). THEN they go back in the x.0.1 or x.1 update and improve older device support. Not an official strategy that I know of, but one a few years of evidence supports.