I used to think that but lately I've been considering switching to Android. Google Now is one of the reasons. Giving me the opportunity to really try it might make be switch now. I think it's because Google Now isn't the kind of feature you can just test in the shop and make a decision on. It requires actual use to know if you like it.
I had the opportunity to use it for a few weeks at work, when developing and Android app, and made the jump from the iPhone to a Nexus 4. Google Now is incredible. Last week I went to another city for a family funeral and the next day it was showing traffic to the place I slept, sights to see, etc. This weekend I was walking around town and a card showed up with movie times. It's little things that wow you and actually turn out to be useful.
The Android experience is very good now, but I would be lying if I said that app quality is nearly as high, especially in things like photography and audio. That still makes me think about whether my commitment is long-term.
I was surprised at first, but as I thought about it more, it makes sense. Google wants to have you using Google's services. Whether that's on iOS or Android, they probably could not care less. The larger the audience, the more their services get used.