Amethyst is good. There's also Primal on Android. You can install nostrudel.ninja as an app as well. Amber is a signer you can use to avoid pasting your nsec into apps. Pokey can give you notifications.

Primal is very good on Android

Amethyst is probably the most well-rounded client for Android. It's got a ton of features, so you can experience most of nostr with it. Primal is also a decent choice if you're prioritizing UX over functionality.