The difference for me isn’t so much the technical implementation of aspects of the operating system, it’s my willingness to trust either Google or Apple with my data. Knowing how Google and Apple make their massive sums of money, I’m willing to trust Apple with my data but I am not willing to trust Google.
Data being sent to Google—in my personal, subjective opinion—a breach of my privacy whereas—again, opinion—it isn’t when it’s sent to Apple.