I want to learn one functional programming language. I would like to know pros/cons of various candidates based on some assumptions (to be specified in question).

Now as it is Opinion based, StackOverflow.com is definitely not a place. Progammers SE could be one place, but FAQ suggest other wise.

Is there any suitable SE forum where opinion based questions are allowed?

Thank You!!!

I didn't find the right solution from the Internet.
References
https://meta.stackexchange.com/questions/208136/which-programming-forum-is-best-for-opinion-based-questions
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