.NET IS open and not really tied to any Microsoft Subscription. I really hate when people keep parroting that without understanding. Rider is nowadays a better IDE for C# and it's not owned by Microsoft. You can host it wherever because it runs wherever.
In my experience, Rider is much a better IDE for development, especially on large codebases. In our few million LOC codebase, VS lags/hangs a lot, navigation is slow, search (like searching for a log string in a codebase) is awfully slow. Refactorings are not useful w/out Resharper etc.
VS has a lot of useful stuff around profiling, performance analysis etc, but as a code editor it's pretty bad.
VS lags/hangs a lot with Resharper installed. As someone who doesn't like/trust Resharper, I have a very different experience of VS performance.
(Also, Roslyn built-in refactorings have gotten so good, I increasingly feel like I should just develop more in VS Code because the language server is the same.)
