When i was considerong buying a fairphone, fairphones with e/os came up and wondered if it was a good option for privacy.
I do not like pixels, and would love nothing to do with that phone. I prefer my one plus and if i can keep that still have my privacy, that would be nice.
E/os can be put on different android phones my one plus included.
I believe CalyxOS is better from a security standpoint than LineageOS and forks (including /e/).
They also support Fairphone.
https://en.wikipedia.org/wiki/LineageOS#Forks
https://en.wikipedia.org/wiki/CalyxOS