If you had to pick a multiplatform solution (for whatever reason) which one would you pick? I've been exploring this space a bit, and it's really hard to form an opinion on this.
tldr; If I HAD to do cross platform I'd use the following logic to choice one: If I have a team of react JS/TS devs: React Native else if I have a .net team: Xaramin else: Flutter
Then I'd apply for a job writing native apps in Swift/Kotlin and run away ;)
Ionic 4+ is a complete rewrite from the ground up to use web components.
I use it in a non-traditional way, I do vanilla js + lit-html + web components and it works great.
Performance is smooth, mobile first approach makes responsive apps straightforward.
I don't do any of the native things or command line app creation or any of that.
I've been generally pleased with it.
Sadly, a shrinking market day by day.
However, the benefits don't need to stop with cross-platform. By adding location independence to the non-application part of the code, you get the flexibility to decide later (even after the application is written) whether to deploy it as a "fat" app (application logic running locally) or "thin" (UI commands and events routed over network to your app running on a server).
I've been experimenting with these ideas for years and it's all doable. I've done various UI/toolkit implementations such as: Cocoa/ObjC, Gtk/C++, wxWidgets/C++, win32/C++, Delphi VCL/Pascal, HTML/JS, Java Swing, Java SWT, etc.
I look forward to being able to share publicly (once I decide which license to use).
If doing games, Unity.
If I require some native access, Xamarin.
Finally, using C++ in a MVVM approach with native Views for anything else.
Those answers are for personal projects, at work we just do mobile Web, and with Chrome and Chrome Edge teams pushing the agenda of Web APIs =~ ChromeOS, we get to do most of the stuff we care about.