Modern react is mature, stable, thoroughly explored by community yet at the same time lean enough to start small (ie scalable and battle tested).

Svelte is promising but way too young.

Vue seems yet a tiny bit behind React in terms of community size and number of hi demanding real life use cases. As far as I see it.

In the end you should start with your specific requirements for the app, not from a fashion question.

There’s no and never be “one choice fits all” answer.