I used GrapheneOS before most people even knew what it was. I liked it, but it wasn't very friendly with a lot of apps back then (by design, so not a knock). CalyxOS, in my long experience, has been far easier for most people to settle on since it is a little looser. Again, since I last used GrapheneOS. Haven't used it for awhile at this point. Will put it on my Dev device though.

I was modding Android on some of the first in existence. It's easier than ever. Times were ROUGH back then for anyone who wanted anything close to tech freedom. Same with Gnu/Linux. It's pretty damn easy now.