Why are these two languages chosen? I would suggest thinking of a niche you want to fulfill - you mentioned web servers, for that use case Go is fair, but do note that Go is a managed language much closer to JS than to Rust. There is probably not even that many new concepts in Go compared to TS (both use the otherwise rare structural typing).

If you want to instead learn about low-level programming, Rust is a great choice, but so is C for some basic concepts.