I don't think Swift is particularly mature in this area yet, and it's concurrency depends upon Grand Central Dispatch. Go on the other hand is rather mature, es

I don't think Swift is particularly mature in this area yet, and it's concurrency depends upon Grand Central Dispatch. Go on the other hand is rather mature, especially for its age. Other than that, it really depends on what the server is for, but in general I would say Go is probably a better choice. If you're interested in something similar to Swift for the server, I think Kotlin w/ Spring Boot would probably be a safer bet at this point.