To think Apple is not interested in the same information about their customers just seems incredibly naive or like some kind of cognitive dissonance.Actually I think there's definitely room for argument there. Apple may be be interested, sure - but unlike Google, they don't have an imperative to collect and sell that information. Google and Apple, for the millionth time, have different business models. Apple takes money from people who buy its devices and software. Google takes money from advertisers. Both are focused on getting the people who give them money, to give them more money. So while Apple certainly could collect and sell this information, they actually have a choice. If Google didn't collect and sell this information, someone interested in a minority-shareholder lawsuit could argue that they were leaving money on the table and doing a disservice to their shareholder.
Apple is one of the most profitable companies in the world right now, and on top of that a company whose corporate culture rejects stuff like Carrier IQ. Google is in a position where they could conceivably be sued for not implementing something like this, and is a company whose corporate culture prizes data, data, data and endless analysis.
It is 100% plausible that one of these companies would implement a Carrier IQ style of rootkit, and the other would not.