Honestly by far the biggest difference between the two is the difference in underlying language. Assuming you already know JavaScript the big question you should be asking yourself (depending slightly on what other languages you already know) is, "do I want to learn a completely new language, with a rather different way of doing things". The answer to this question is far more relevant than any differences or similarities in frameworks.

All network IO in go is non-blocking. Channels and goroutines avoid the nested callback mess. Go is also a better designed language than JS.

Gorilla[1] provides nice libraries for web development in Go.

[1]http://gorilla-web.appspot.com/