Brexit

There's a bit more nuance to the tablet debate. If your price point is $800+, then yeah the iPads are best (unless you want the best media watching experience, then the Samsung ultra is a real competitor), but under $500 and there's a very good argument for Android. You can get an iPad with an A14 Bionic for the same price as a galaxy tab S8. Their graphical performance is within 2% of each other, CPU performance is about 15% better on the iPad, but the Samsung has a 120hz screen and the iPad has a 60hz screen. Also the aspect ratio for the Samsung is closer to 16:9, so more screen for media.

The above is also purely hardware focused. Most people swear by an O.S due to familiarity or features. Some people like Android's customizability or power. Emulators for example require jailbreaking on iOS, on Android you can just install emulators, install Linux distributions (I have an ARM install of Ubuntu on mine), and other things like that that would normally require jailbreaking on iOS. On Android you can also root your phone or install a custom ROM to customize your phone even more or get even more power, things that just aren't possible on iOS.

Meanwhile people usually "like" iOS for ecosystem features. If regulations ever open up iMessage, FaceTime, etc. to the wider smartphone market, Apple's market share in the phone space could definitely crash, because a lot of iOS users aren't actually passionate about their operating system, they just want access to the ecosystem.