Problem is that Apple has always been even more about lock-in and user tracking than Google, though Google has been catching up on that front quite a bit. But at least Android has some open source components to allow knowing what's tracking you. Problem is the manufacturers then add another layer of tracking and lock-in if you use phones from manufacturers like Samsung. So you may or may not be reducing the number of companies tracking you by moving from Samsung to Apple, but you're increasing the amount of data that can be captured and linked to you and preventing yourself from using privacy apps that might be able to block some of that since iOS has much more strict control over what the user can do with their device at the OS level and forces developers to use their tracking systems in a lot of cases for things like error handling. So overall, moving to Apple is increasing your exposure to tracking, even if reducing the number of companies who have the info for free, of course they all sell all that info, so that's not really an advantage.

A year ago I would have suggested getting a Pixel phone and installing GrapheneOS, but it looks like Google is moving to kill off alternative OSes on Pixels, so not sure what's the best bet at this point.

But Apple has always been of the mindset of controlling user experience and security over configurability and privacy which many prefer since they want it to "just work".

Remember, security, privacy, and usability always have to be balanced. For example, if you want a chat app that is both secure and private, then the app servers have no information to make things more usable, like how do you share your hardware address for communication to go to if there are no user IDs for privacy. You have to do that outside the app, thus less usable. So if you see an app that is very secure and usable, it likely is not very private. Signal is a good example on the chat application side since it uses a phone number which is then linked to lots of personal info, but it has very secure messages and is very easy to find your friends on it (usable).

Apple generally prioritizes user usability and user security with the detriment of user privacy and developer usability and privacy.