I want to learn a new front and back end webdev language. So far, I've found Dart and TypeScript (though this one is not completely new to me) on the front end side, and Go, Elixir and Rust on the back end side. As I don't have too much free time, I can choose one of both sides for now, but I can't decide which ones to go with, since I can read so many pro-contra opinions.
I only need to choose for the skill, I don't have any specific target, I just want to learn new stuff.
Which ones do you suggest?