GrapheneOS is only on a Pixel bc of security reasons. How you use the phone will impact your privacy.

GrapheneOS is both, it is a privacy and security focused OS and would encourage reading of our documentation at grapheneos.org to dispel any myths. As far as the other mentioned OS I have a previous note you can refer to here: View quoted note → Also reference this comparison across relevant feature sets...

Comparison of Android-based Operating Systems

Comparison of Android-based Operating Systems