For me personally Elixir is the weapon of choice. But it’s probably fair to say, that if you want “simple CRUD app” that the OP asked about, and you have little experience in functional programming etc, then Rails is proabably easier to pick up for that purpose.
Depending on just how simple it needs to be, I'd reach for Sinatra, or Plug, even, actually plug is arguably better since you can easily scale to Phoenix.
