They're both old projects. Lineage focuses on basics and wide device compatibility. Graphene focuses on privacy and security.
Discussion
Cosign on Lineage, but graphene is a tank so I would be slow about giving it up.
To each his own though. Heard good things about /e/OS as well.
have you tried a linux phone?
A Pinephone. My experiences with all the software have been dysfunctional. The operating systems are buggy at best. It’s possible that a vanilla SIM with native apps would work, but outside of that use case, not great. Your experiences?
Didn't know it was a thing