@falktx

A simple answer to a simple question

Truthfully I am not a gui designer. I find gui interfaces generally frustrating. The very best are helpful, but they are an exception

Also I have no experience in the last decade with Qt or GTK.

I have dealt with:

Flutter
SwiftUI
HTML5

I have had to design some UI, but mostly maintain the plumbing backing them up

Of the three, from my perspective, there is no competition: HTML5 is much better. Continued....