Flutter: if you want a pixel perfect version of your app that looks similar on Android and iOS. Some quite popular apps use it and make a shit ton of money, for example Headspace. More here: https://flutterhunt.com/

React Native: totally viable, because core business logic is the same. If you want native UI elements and all the iOS Liquid Glass stuff, but don’t want to have to completely separate code based, React Native is a viable option if you don’t mind installing lots of third party packages for functionality you get out of the box in Flutter or true native apps.

Native mobile: I have one smaller app with quite a custom calendar view, written with Claude Code natively for Android and iOS. Coding agents help and you get maximum control. Mentally, it’s a bit cumbersome to direct you agent to do everything twice. While one platform can serve as a reference implementation for the other, it’s kinda annoying mentally "to do the same feature all over again and test and direct the agent". But it’s doable.

KMP: No experience, I just hate most things around Android.

PWA: That ship has sailed. Nobody knows about PWAs, most PWAs are bad. It’s a bummer really.

Capacitor: make an SPA (offline-first preferably), and use native code plugins via Capacitor. Still quite feasible, comparable to Flutter in the sense that you need to build a custom UI or use a fake version of Liquid Glass and Material. I use Ionic for that, but it’s a bit dated (still on Material v2). Heavily depends on your skills as a web dev to get good UX.