Unless you’re looking for a completely partisan answer (eg: .NET Core all the way, or Rust or Bust!) more details are needed to answer this.
SvelteKit for the past month, I'll never start a new project using React again. Unfortunately consulting for frontend is almost always consulting now but I can see the migration from React to Svelte starting to be profitable for business
For? Web? ML? It's like asking what vehicle people use, depends on the purpose!!
For web, I use React, Svelte, NodeJS - always with TS.