Learn Functional Programming with Elixir (Beginner): I didn’t read it, but it seems to cover the basic stuff in depth, so no intermediate / advanced topics. It seems to be a great book when you want to start your career in programming with Elixir.
Programming Elixir (Intermediate) or Elixir in Action (Intermediate): They are similar in essence, both are suitable for beginners with Elixir and functional programming, if programming isn’t new to you, then you’re good to go.
Beginner: Elixir’s syntax.
Intermediate: Beginner + OTP, GenServers, Supervisors…
Programming Elixir is more practical, you’ll learn Elixir by doing exercises.
Elixir in Action is more technical, you’ll gain a deep understanding on how things works.
Both are worth it, sadly I can’t make a fair review for “Learn Functional Programming with Elixir”. If the book you mention focuses in Elixir 1.4, then some modules are deprecated, like HashDict or HashSet.
Good luck in your journey!