[aczerepinski]

I'm not the parent poster, but I love both Elixir and Go and have both in production at work. My two cents:

Phoenix is a joy to work with, so I like Elixir for the full-stack crud apps that you might otherwise do in Rails. The server-rendered HTML experience is every bit as painless as it is in Rails (this is not a selling point for Go), you get very good tooling for free, Elixir is fun to write, depending on the application the channels/websocket stuff can be a huge lift, etc.

I like Go for stuff that doesn't have a web front end - APIs, CLI tools, background services that need to be fast, etc. In my personal experience based on the small number of Elixir & Go apps I've written (only a few of each), Go gets the edge for performance and server cost. It isn't as quick to prototype in Go as it is in Elixir, but the type system pays off over the long haul.

Again just my quick take - both are really great IMO.