I'm an Apple user and currently do not own any Android devices, but the constant force-feeding of updates by Apple might make me jump ship to Android.
I had an iPad 2 that I bought in 2011. It was a great device, very snappy and a pleasure to use. It came with iOS 4. When it upgraded itself to iOS 5, it slowed down a little but was still usable. At this point an alarm went off in my head and I have refused all the pop-ups telling me to update to IOS 6 ever since.
Well lo and behold, in the fullness of time an ignorant member of my family tapped "YES" to the "Update to iOS 6" message. Running iOS 6, the iPad became a complete dog. Launching web browser took 3 seconds whereas it used to be well under a second in iOS 4. Not just the web browser either, doing just about *anything* with the ipad (even viewing photos stored locally) became a lag-fest.
Eventually I upgraded to iOS 7 in hopes that it might help (because Apple does not let you downgrade back to an older iOS version, ever). It did not help. At all. I ended up giving away the iPad because it was pretty much unusable.
But why should it be like that? The iPad's hardware was just as fast in 2015 as it was back in 2011. Aside from the ability to hold a battery charge, it should perform the same.
I would be happy with a setting somewhere that lets you turn off the "Update" pop-ups, but no, Apple does not let you do that. They want you on the latest bloated OS, and if your older hardware can't handle it, buy a new device.