I bought an iPad Pro earlier this year in anticipation of switching to the iPhone, before I ultimately settled with the Pixel. I don't mind iOS as a tablet (just as I don't mind using macOS), but I'm really tied into the Google ecosystem. Sure, Google apps work well with iOS, but just try and share a photo from Google Photos to another app on iOS. It's a hassle.
Also, Android just does a lot of day-to-day things better, which makes doing things on the road more efficient. Android has batch notifications; iOS doesn't. Google Now and OK Google are substantively and functionally better than Siri. Google gives you better results, and the "OK Google" voice detection comes in handy a lot. And Android just gives you a lot more freedom in an easier way. Full-functioned, third-party password managers, for example, can overlay over existing apps to auto-fill your username and password. SwiftKey and other third-party keyboards work seamlessly and Android doesn't revert to the original iOS keyboard in certain instances. You get Chat Heads with Facebook Messenger, which iOS still doesn't allow. Google Maps just works a hell of a lot better and is extraordinarily powerful on Android. The new Android Auto on your phone is just boss.
Don't get me wrong--Android has its share of gripes. There's no iMessage-like system, so there's no easy way to access SMS/MMS on your computer. Lots of friends (and family) are stuck in the iOS ecosystem, so they use software (iMessage, FaceTime et al.) that doesn't work with Android and it's annoying (sometimes). Lag has been Android's kryptonite for years, though the Pixel seems to have fixed that. Snapchat is still garbage on Android and likely will be for the future.
I also think that I just buy into Google's business model and philosophy more than I do Apple's. Apple is all about proprietary and forcing customers to adopt their way of doing things. For example, I bought the Apple Pencil to annotate a lot of PDFs for work and was just flabbergasted at the fact that I had to plug in my Apple Pencil into the Lightning port on my iPad Pro to charge the damn thing. Apple's Lightning port works with nothing but Apple. Apple keeps their entire ecosystem inside iOS.
Google, on the other hand, is alright with replicating their experiences on Android and iOS. They give you more freedom and more choices. And that matters to a power user.