[WorldMaker]

> Which .NET framework do you use (Core/LTS)?

There is no "Core" anymore: LTS is now .NET 6. If you are building webpages, the "Legacy" .NET Framework 4.x is no longer relevant in any way (unless you are unlucky enough to have legacy apps with no drive/budget for cleaning up tech debt, and I'm sorry on your behalf). The last LTS "Core" version (.NET Core 3.1) is out of support in December and the upgrade path is simply .NET 6. There's only one choice right now and it is .NET 6. (It'll complicate a bit with .NET 7 in a few months, but only in the alternating LTS/"current" versions way of things like NodeJS, nothing like the Core/Framework confusion of the past few years.)

> MVC, Razor Pages, Web API and Blazor

MVC and Web API merged many moons ago, it's not really a choice between them, they use the same APIs and are built the same way way today.

(Editorializing: Razor Pages is making many of the same mistakes of ASP Classic or PHP/ColdFusion over again, and I don't see it as a great choice personally. Blazor is making similar mistakes to both Razor Pages and Silverlight, and really feels like ASP Classic 2.0. I understand its appeal to some development teams, but wow does it seem like a clunker from my vantage point.)