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But how can we, at the other end, understand that?

In my opinion, the worst Android flavor among the popular ones is the Samsung’s One UI. Notoriously bad in terms of tracking and telemetry. Yeah these Chinese ROMs are certainly bad, but where I am from, these are few and far between.

The worst thing about Samsung is the inability to install any Custom ROM despite it being a Snapdragon chip. Other manufactures like Xiaomi or OnePlus sometimes let’s users do that (albeit the process might be a little difficult).

But to answer your question, look into LineageOS’s supported device list. Pick a device from there and install LineageOS. Or better still by a Pixel (there are talks about a partnership with an unknown OEM and GOS, but no clear news on that as of yet) and install GrapheneOS.