I am a novice entrepreneur and looking at starting up for the first time. I am a coder and have been on the Java stack primarily so far in my career.

What do you think would be a more important factor while picking up a stack for building one's product:

a) how well-suited a stack is for that particular product, or

b) how easy will it be to hire talent that can code effectively on that stack.

Say, for a product that's gonna be very concurrency-heavy, a modern stack like Elixir makes a lot of sense. It fits like a glove and has a proven history of high performance on similar products (eg: Whatsapp with Erlang). However, hiring for engineers with Elixir experience can be highly restrictive and may take a lot of time, if successful at all. The stack, although very exciting, is risky from a hiring perspective.

Instead, if Golang is used (which also performs decently well on concurrency), hiring devs experienced with the stack or finding devs who are willing to pick up the stack will be substantially easier.

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As a founder, which one will be more critical for the success for a startup?

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PS: In either case, I will be learning it from scratch since the stack I know (Java) is a very poor choice for this particular product.