I am using the Memmy beta from TestFlight (IOS). It is inspired by the Reddit app Apollo.
Mastodon
The project: https://github.com/mastodon/mastodon
Mastodon instance affiliated with Lemmy.World: https://mastodon.world
Discuss the Mastodon platform here. Follow the lemmy.world rules.
I tried pretty much every Mastodon app on iOS at the time I moved over from the Birdsite to Mastdodon, and I settled on Toot! I like the UI and it does everything I need. I still use the web portal sometimes if I happen to be on my laptop.
Megalodon for android
Ice Cubes. It lets me follow other server's local feeds. Really handy.
Moshidon which is like Megaldon
I use Trunks, it's really great in terms of UI/UX.
I've been a happy user of Tusky (Android). I have my edit button, and I can jump between multiple profiles. So I'm a happy camper.
Ivory. Using it across iOS, macOS and iPadOS. As a former Tweetbot subscriber I love the interface and design.