Does this version improve or streamline the numerous options for web dev like Razor, Blazor etc? Anyone can comment on which is actually being popular
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Razor is still the "default" and "Razor Pages" has a different brand name, but just means "Razor with more things in the main .razor file and fewer code-behind .razor.cs files and less of an MVC approach".
Blazor mostly only matters if you want your frontend to also be Razor. At that point you've got the fork between Blazor using SignalR for HTML pipes from Razor files to the client versus Blazor running client-side in WASM with a Virtual DOM renderer based on Razor.
Blazor seems popular among some groups that want everything in C# rather than needing as much of a Typescript frontend. Blazor WASM bundles a full version of the CLR into WASM so mostly only popular in places where you don't need to optimize the initial web bundle.