Very basic comparison. Doesn't go into the quality of the generated code, compiler speed or efficiency, etc.
I want to know how the languages compare for writing code. Dos one make it easier to write more succinct and correct code? Swift is missing concurrency support until at least the next version, for example.
Swift is built atop LLVM, and it emits code more slowly, but supports many optimizations like hoisting, vectorization, etc. that Go does not currently perform.