We also checked out both Go and Scala and picked Scala due to better IDE support (IntelliJ) and existing Java lib ecosystem. It also is typically faster than Go (but does use much more memory): http://benchmarksgame.alioth.debian.org/u64q/benchmark.php?t...

Overall very happy with our choice. I will probably learn Go too, but I also don't really like the way it does error handling and the tooling support seems limited vs what I can get for the JVM.