[59nadir]

I've used Elixir since 2015 and in fact learned it first. I still think "Programming Erlang" is a much better book than any other for actually learning Erlang and BEAM/OTP principles. Erlang as a language is simpler, leaving more time and energy for learning the actual important bits about OTP.

[Miner49er]

Also Elixir abstracts even more of the OTP and does some automagical stuff with it. Erlang is more explicit, which is better for learning, IMO.