@unity /e/OS has egregiously bad security. It doesn't preserve the basics of the Android security model or provide proper patches. It's filled with fake privacy features and their own privacy invasive apps/services.
GrapheneOS and /e/OS are very different. GrapheneOS is a hardened OS with substantial privacy/security improvements:
https://grapheneos.org/features
/e/OS is not a hardened OS. It greatly reduces security vs. AOSP via added attack surface, weakened security model and slow patches.