On mobile, I'm using the Voyager app, which lemmy.world has installed as an alternative front end. Seems to work great.
On desktop, I'm using the amazing Alexandrite UI (https://alexandrite.app/) which solves all of my interface annoyances with the regular Lemmy UI (infinite scroll, opening posts without losing place in the feed, easily accessible communities list).
I love how flexible Lemmy is proving with its UI options... there really does seem to be something for everyone!