Comment by germandiago

As a person who looks always at Java and C sharp with curiosity, I am a bit divided.

For me C#'s value is obvious in the frontend and also games compared to Java (except for mobile, where Java can be used but Kotlin seems best).

But for the backend I always wonder if I should invest more on C# or Java as I go.

Also, it worries me that Java is a memory hog, which C# seems not to be. I like to have lean server-side software, to the point that my usual approach has been to use C++ paired with Capnproto, but if I had to go with something a bit more high-level for web work, I am not sure.

Currently I am investigating Clojure for non-critically-fast backend. It seems to be a lot of fun and since I am using https://fennel-lang.org/ (replacing part of my Lua code) and I expect https://jank-lang.org/ to become something at some point, maybe it is worth to stick to it?

How would someone that has more data than me compare Java vs C# in terms of performance as-in "what machine you need in the cloud" to do useful stuff, mainly for backend work, asynchronous, in terms of CPU and memory for both?