Like there is the Official Mastodon app for Mastodon, and Element app for Matrix, which app is considered the most official lemmy app for Android [possibly also for ios]
Or atleast, the app which supports most(if not all) the features available in Lemmy
Graphene isnt supposed to be a fork of Android?
If I tell you what I use you will start to cry in pain so I will save some sadness.