I've only used Golang and Swift fairly extensively with a cursory use of Rust. I'm also extremely biased because I'm an iOS engineer, so I'm going to advocate

I've only used Golang and Swift fairly extensively with a cursory use of Rust. I'm also extremely biased because I'm an iOS engineer, so I'm going to advocate Swift. I really love Golang's concurrency model and the way the dependency system is implemented. It just seems like the Swift team is making more progress at a faster pace right now. The tools surrounding swift like the REPL are also extremely useful for education, documentation and examples.