I just installed Calyx and I love it, the biggest difference for me is.
1 MicroG instead of sandboxed play services.
2 You can relock the bootloader, which got some of my banking apps to work again.
I don’t know if Graphene has these features but some other things I like:
You can revoke fine network access (revoke all or jikust background/mobile/WiFi data per app).
Seedvault can backup your phone over webdav. Unfortunately it uses abd backup so it doesn’t backup all apps.
It adopts some Lineage features like snoozing notifications
Feels like Apples already giving up on the Vision Pro, not sure Android should even put resources into this