Is a Chinese phone's stock OS better than GrapheneOS for my threat model?

If you’re getting pulled over and using your GOS phone for directions or answering a message, do you have time to stuff it in your pants? When frisked, that’s a HUGE red flag that is easily found. Police in places where they have extraordinary powers to stop people and search their phones mean that on a long enough time line, they’ll feel like tossing the car and searching their person looking for something of value. another phone is worse to find than OP’s idea of having a not-obvious profile. IMO, the not obvious profile is more easily hid from non-tech-savvy cops that just need to look and say “looks fine, meh” and let OP move along.