Elixir's syntax is much easier compare to Erlang's prolog inspired syntax.
I think anybody coming from any C inspired language would take Elixir over Erlang imo. Sure Erlang is a small language but the hump is much higher to get over the syntax than in Elixir.
I learned a bit of Erlang first, and never really found a taste for Elixir's syntax. Can't say that I've really used it beyond tinkering though.