Does iOS have Google Now? that's actually my killer app right now. I LOVE that it scrubs my email to track packages and fight information. It gives me driving times to work, to where Hotels are booked, to friends' houses I frequent, all at approprite times.
Tells me about concerts I want to go to correlating my searches and location, weather where I am and where I want to be.
Essentially it's using all of the information it collects on me for me, and I am happy with the trade.
My recommendation to people until 4.x was get iPhone unless you are into the Google ecosytem on your desktop, now I honestly think it's a wash with pros for both. The last real killer feature of the iPhone for me was size, they eliminated that. When the first retina displays hit, I think they were definitively the best phone until things caught up. Even now, a lot of Android phones seem to have good screens on paper, but when you look at them, they're just a little off, but I think there's actually vibrant competition, and it's not just on price.