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Probably depends on the type of Ruby developer. As a Rails guy Elixir seems more useful for my day-to-day but Crystal is indeed compelling.

When I did a comparison:

Crystal has 1,209 repos https://github.com/topics/crystal

Ruby has 19,721 https://github.com/topics/ruby

For those who needs performance for specific tasks, the option is easy since it’s a small investment to learn Crystal but Elixir is mature.

If we are targeting DevOp, other languages has several advantage like Go for microservices and could be work within mobile app.

There is definitely a lot of Elixir developers who come from Ruby. I mean José Valim himself was a core RoR team member.

I'm trying to find an Elixir job right now and pretty much all of these comes with a RoR requirement. (also it seems some companies are moving from Elixir to Go).

As I'm mostly a PHP / Symfony guy I feel the disconnect, and at my current place people really don't care about Elixir at all. Basically Go and Node would be much better prospect for me.