I moved from Android to iOS last year for this exact reason. Using android over a few versions felt like a slow slippery slope of access prompts giving permission for google to use ever more personal data about me and my phone. The final straw for me was learning that google uploads and stores audio recordings of everything I've ever said into google now[1].
A year ago when I got my iphone I deleted all of the historical voice data that google stored. Just now, In the process of finding the google activity link below, I've learned that all my deleted voice clips have magically undeleted themselves.
I've been very happy with iOS - there's some little UI gripes, but for me the biggest feature is Tim Cook standing up to the US government on behalf of privacy. I'm convinced that as an organisation Google just doesn't understand what privacy is or why its important to people. With all the new deep app intelligence features in android, I shudder to think about simply how much data google might be storing about its users. I'm very happy to be out.