Okay, now I feel like I need to chime in.
As an iPhone user (I don't run GOS anymore), let me tell you this:
iOS (Apple devices in general) have nothing to do with privacy. Security, yes. But they are far from being private.
Examples? Sure.
You can't disable apps. They can run at all times and collect or send data in the background.
There are no profiles (this ties into my prior point). You can't isolate apps or put them to sleep by putting a profile to sleep. All IPC is gonna continue, no matter what.
Their advertising on app tracking transparency is also misleading.
You have no alternatives for Apple's push service. No UnifiedPush available. You can't even decide to omit an app from Apple's notification system. It will register nonetheless.
You have way less permissions and therefore way less fine-tuning.
The ability to turn off NFC or complete internet access for an app only exists in just a few select countries (I think it's just China actually).
You can't prevent most Apple services from talking to Apple, otherwise functionality inside the OS might break.
DNS requests made by Apple devices are vast and numerous. They easily outdo a GOS device by 10 times. What all that communication to Apple is needed for? Don't know. No documentation.
Data collection inside the App Store and some other apps is creepy. I had a takeout of my data; there's so much (unnecessary) data collected while you're unaware of it. Dating back 15 years, when I got my first iPod touch.
You are tied to the App Store, so Apple is guaranteed KYC for every app you install. This also ties into the problematic political landscape they face, where they ban VPN apps in certain countries or let the CCP have their own iCloud servers.
And if countries decide to ban E2EE, Apple will cave in, removing the option like it just happened in the UK. With no real alternatives for cloud backups (or general cloud integration), you are SOL.
Due to developer fees and the general Apple culture, FOSS apps are pretty rare. Only developers who scale (Nextcloud, Brave, Signal) can afford to have their apps in the App Store. Other FOSS devs stay away. Alternative app stores in the EU have changed nothing about that situation.
That's just a few points that should dissuade you from blindly trusting their marketing claims.
Half of the shit they market as "private" is also present exactly like that for their competition. Bragging how 10% of your portfolio is E2EE by default is actually cringe.
I know my iPhone isn't private and that's simply not part of my threat model.
I'm not even starting on possible backdoors and security problems (and how they are handled) in Apples OS'es.
If you care about privacy, you are better off with a GOS phone. Like actually WAY better.