GrapheneOS wins, but whether iOS is more private than CalyxOS or /e/OS I think is very gray, and depends on the threat model, and on most devices they are going to be a significant improvement in privacy, and often security, over stock Android.
And privacy may not be the only consideration when choosing a device.
Since my threat model includes mainly surveillance capitalism (and no evil maids or targeted attacks) I don’t particularly feel like trusting a big tech that’s running their own targeted advertisement system.
And you think degoogling offers no obvious benefits in terms of privacy?