I was recently at a Microsoft heavy tech conference and spoke to at least 50 .Net developers. Anyone who also did front end did so in Angular. I was surprised at how popular it is!
Outside the public sector React is a bit more popular, but it’s still mainly used outside of enterprise and Vue rarely sees any use.
The job-market doesn’t seem to follow the tech hype cycles much, at least not when you live in a country like mine.
If you know your application will have to be enterprise grade, will be large, will be developed by enterprise devs and has to be supported for years to come, Angular is still the definitive choice (IMHO). Mainly because it gives your team a clear structure to operate in combined with known concepts.
This fact about Angular doesn't surprise me. It uses TypeScript which is a Microsoft joint, and the architecture feels rather similar to the MS standard MVVM. Two way data binding in the UI, a "code-behind" in the component. And TypeScript lends a sort-of C# flavor to the framework. It takes some "enterprise" and puts it in the front-end, which can help make the transition from ASP.NET MVC or whatever to Angular a bit easier (especially as compared to something like React).
If you're already doing .NET stuff, and you need enterprise-grade front ends, Angular seems like the natural choice still. One thing about Microsoft shops (of which my employer is one) is they tend to use Microsoft for everything, and despite Angular not actually being Microsoft, TypeScript makes it close enough. I'll be curious to see if the eventual production-ready release of client-side Blazor changes the dynamic at all.
However, you can see just how popular React is by number of npm packages that depend on it: https://github.com/facebook/react
Both have a relatively high entry barrier compared to their alternatives (though lower than a few years ago).
If we are using just a couple of WebComponents with traditional server side rendering, then Vue.