Go blows away Node in pretty much every way IMO. You get all the niceties of blocking code without actually blocking, you get (relatively) tiny binaries that you can deploy anywhere with ease and no fuss, instead of 250mb of node_modules that everyone comes up with hacks to work around. You get a very strong stdlib to stop re-inventing stuff (poorly in many cases), a rich selection of 3rd-party packages from a community of seasoned engineers, incredible tooling for debugging, profiling, monitoring and so on. You get normalized code that looks the same no matter who in the community wrote it, auto-generated documentation, a built-in test framework, built-in benchmarking, static typing and all of the benefits that go along with that, less fragmentation (concurrency models etc), the list goes on.

JavaScript will have an edge due to the browser, but even that won’t last forever with WebAssembly coming online, then it will really be down to personal preference. JavaScript is nothing special in terms of language features, so I don’t expect it to “win” long-term, the object model is pretty nice but there are many other great options. Personally my biggest mistake was not giving it an honest try earlier, I felt it was ugly but the look grows on you, and it’s incredibly easy to read which is hard to say about most other languages.

Also Lambda and friends don’t just sandbox using V8, they use containers just like they do for Ruby, Java, and the others, so there’s no real benefit to JavaScript in particular there. Plus when you can deploy a Go binary in 1 or 2 seconds it feels plenty “first class”.