Does anyone know how /e/os compares to graphene os for privacy? I am thinking of getting a murena fairphone which comes with /e/os but supports custom OSs and am leaning towards graphene, but don't know much about e.
Graphene do not support fairphone, but you can use calyxos, which supports fairphone (with verified boot?), and it is more up to date.
In general, I think calyx is probably more up-to-date and secure, with vanilla android experience. /e/ has its own unique athetics, and a SSO cloud service powered by nextcloud (last time I checked, nextcloud dont have good E2EE support, so I personally avoid putting my stuff on a nextcloud server hosted by others. But it is your choice)