On top of that, you can use network-level tools to block your data from leaving your home. This could be something like a pihole that blocks the relevant domains, and/or a firewall that blocks them entirely.
At least on paper, Apple does seem to be doing better on privacy. They are private by default. Again, this all depends on how much you believe they aren't lying. There are also edge cases with them. For example, iMessage is encrypted end to end, but if you make an iCloud backup of your iMessages, those are not completely protected.
If someone is that paranoid about the OS being the point of failure their privacy, open source OSes are available for them to use. I'm personally not concerned about using Windows, MacOS, iOS, or even Android as long as I am thorough about configuring all the settings in the OS and my network appropriately.