I have been an Android user for 13 years now. After using almost every Google service possible I am going down the privacy rabbit hole lately. Gmail -> Proton Mail, Chrome -> Firefox, Keep -> Notesnook, Google Search -> Kagi, ...
I am currently using a Galaxy S23 with as few Google apps as possible (and focussing mainly on open-source apps). I am familiar with rooting (I was a CyanogenMod user back in the days), but today I want to use the phone without tinkering and problem solving. I also like to use a smartwatch and banking apps, so GrapheneOS is a no-go unfortunately.
So it is "Stock" Android (or Samsung's Android ) vs. iOS for me. Is it better (in terms of privacy) to use an iPhone or stick with an Android phone with an system wide ad-/tracking Blocker (I use Adguard)? It seems there are more privacy-friendly/open-source apps on Android.
There are two ways to approach this. You either get an iPhone and try to stick to using as many of the Apple applications as possible and no other third party proprietary apps, that way only Apple has all of your data.
Or, you get a Pixel, and you can use some proprietary third party apps and you use something like NetGuard to block their access to the internet so they can't collect data. This way only Google has all of your data, albeit they are a more invasive company than Apple.
When using any other Android device such as a Samsung, both Google AND Samsung will have your data. So in that sense it would be much worse than an iPhone. The only regular Androids that can compete with iPhones for privacy are Pixels.