Leaker reveals which Pixels are vulnerable to Cellebrite phone hacking

They couldn't answer the question most on my mind: "We’ve reached out to Google to inquire about why a custom ROM created by volunteers is more resistant to industrial phone hacking than the official Pixel OS. We’ll update this article if Google has anything to say."

I'd almost want to avoid GrapheneOS because it gets so much attention from law enforcement that it's probably a big target for various agencies to find vulnerabilities in.