I've always had Androids, and my wife has always had iPhones. Recently I setup a Pi-Hole on my home network and I was floored by the number of network requests to various tracking services my android was making in comparison to my wife's iPhone. My wife has the facebook app and is always playing those junk free freemium games - but my relatively clean android was averaging at least double the amount of DNS lookups and blocked tracking domains. Apps that I hardly ever used, that I hadn't even opened since my last phone reboot - were almost constantly phoning in to some tracking service or another. It was an eye opening experience. I just recently switched to iPhone for my first time and have found replacements for most of the android apps I had become accustomed to. I want to be clear that switching devices isn't some magical button to disable all tracking, but I have seen a significant reduction in both the number of tracking domains on my network and the frequency that they are called. Now the blocked requests are much more in line with times that I have various apps open and not all the time whether I'm using it or not. I also feel better about the type of data apps have access to vs. the almost free-for-all of Android. Anyways, that my anecdotal experience with the two types of phones.