Once again, any tiny speed difference is largely because one phone is pushing a low res, antiquated TFT LCD screen, the other one is pushing a high resolution 2K OLED screen. Yes, it's important and I really enjoy my nice screens.. iPhones hurt my eyes in comparison, their screens just look bad.
Fortunately for privacy nuts, they can do things like install proper no-root firewall that block ads/tracking, like Adguard. While iPhone you are pretty much out of luck. The cameras on Galaxy phones are better than the iPhone, period..
The choice isn't really even a choice.. If you want power, flexibility, a gorgeous screen and great camera you go with a Galaxy. If you are a brand loyalist that enjoys simplicity and doesn't care to configure anything, go with an iPhone. I have both sitting right here and I can be very objective about them and quite frankly, there is no comparison.