I want to mainly use it for privacy over its “security”. I don’t know what makes everyone fine with running it on fucking google pixels. Is there some kind of “low security” version or something for other phones? I’m so tired of certain organizations infiltrating privacy communities and making people believe in improving “security” by voluntarily giving up on privacy and using even non free software like that insecurities blog and other people.
TL;DR Unless you’re being persecuted, I’d say the most important criteria is picking a modern phone actively supported by a ROM. Samsung, OnePlus, LG, FairPhone, … they’re all fine.
What’s your threat model? Most likely, if you’re just a normal dude, the most you’ll have to fear is someone stealing your phone and trying to replace the OS on the phone. Probably every modern Android phone protects against that with secure boot. If somebody wants to read your data, IINM every modern Android phone has encryption activated by default meaning so do modern ROMs.
If you have somebody knowledgeable enough to start attacking your phone by opening it and messing with hardware, you’ve got an entirely different problem and if they want to get in, they will. Either physically through you (a wrench can reveal your password), a 0-day (iPhones were hacked through iMessage by text messages the user never saw aka zero click), or through some yet unrevealed vulnerability if you’re that important.