We have a lot of users here who switch from Apple to Google; and vice versa. I too dislike Apple notifications. I like how Google/Pixel handles them. Are you planning to go back to the 5? I'm sure there will be users on here in your specific situation. Good luck, and let us know what you decide!
By "privacy", are you referring to Google's or Apple's? I feel like with any phone, there will be "listening" of some sort going on!