The privacy feature I like best in #GrapheneOS is the ability to turn off the network access for a particular app. It's a mandatory permission in #Android, and simply taking it away would break a lot of apps. So instead, GrapheneOS just tells the app that the permission is granted, but the network isn't available.
I'm used to #SwiftKey, but it makes me uncomfortable that the keyboard knows everything I type and has functions that call home. You can turn them off, but you never know. In GrapheneOS, you let it download dictionaries and kill the network access, then you know for sure.