I still don't understand why there is a comparison of iOS and Android adoption rates. Both operate completely different and comparing them directly makes little sense.
Android is open source, so it is available to consumers much sooner than iOS is. So day 1 for Android is not the same thing as day 1 for iOS.
Overall though, ever since security upgrades have been decoupled from main upgrades, I prefer waiting a bit for my android device to get updates. Unlike iOS, most new features can be replicated via some 3rd party app. the ones that can't are usually hardware based anyways. (That is if I even care about the new feature. Most new features these days are gimmicks)
In the meantime, I want to be sure the apps I do use actually work. Which means the developers need time to play around with the final version and do any fixes. Because my app not working is much more an issue than any new feature. All my friends dread iOS upgrades as the apps they use keep breaking here and there.