IME they're both in a place where Rust is maybe ~40% faster for a decent CRUD web application server, but with go you need to write much lower level code to get there (e.g. using composable generic iterators will ruin your allocations, so it's all manual for loops). You can write idiomatic high level Scala and get the same performance. Which could be as simple as the go compiler offers no ability to force inlining and has way too low of a complexity threshold, but that basically makes reusable code unusable in high performance situations.
The whole go team's philosophy tends to also revolve around assuming their users don't know what they're doing, which is annoying. Like an inline keyword: thinking you know better than me doesn't mean I'm not going to inline it; it means I'm going to manually write it inline myself in the code, and then think the language sucks because it's tedious, error-prone, and verbose. Or they tend to mark lots of stuff private for no reason, and e.g. with TLS 1.3 they just ignore your config because they think they know better, etc.
