Well Blazor is new so React will have a bigger community, however there are millions of C# devs around the world and they can be instantly productive with Blazor so it shouldn't be that far behind, if at all.

While React's ecosystem might be huge, the quality trails off quickly and it's pretty messy even with the popular stuff, much of which is to add functionality that every app needs but isn't included in React itself. Blazor already comes with everything included, but can also use the full power of C#, the massive standard library, plenty of 3rd-party packages, and the tight integration with the backend.

I suggest looking at some of the Blazor presentations (by Steven Sanderson the original creator) to get a sense of just how quickly you can build: 1. https://www.youtube.com/watch?v=Khn7sDUSEJM 2. https://www.youtube.com/watch?v=QnBYmTpugz0 3. https://www.youtube.com/watch?v=kLhoRyLxwAE

I like Blazor, but to be fair, coming from VueJs, it feels not finished. Some things are just more complicated that they should be. But things are changing, so we will see what happens in the next releases.