While I might not be the best as I just joined using .NET for an open source application 2-3 years ago, I did just convince my boss to let me rewrite our (really crappy) Java application with a new version (to enable her 2 year vision) in .NET.

Spring boot vs .NET is pretty similar, they both offer DI, Filters, Middlewares, etc. The ways I really proved to switch (given my development team is usually freshers) is to showcase the power of the Identity framework, LINQ (especially with EF Core and the ability to still use Raw Queries), and just overall being easier than Java (LINQ methods, extensions, syntax sugar).

Another big one is how damn easy it is to update and the performance posts MS does with the improvements. So you literally change one line in simple web apps and get performance boosts. Java doesn't really have that PR and the language (imo) is very verbose and painful to use (like their stream API).

All in all, we are building our rewrite in .NET (and Angular 17) and my team and I couldn't be happier.