Haskell. I think that more people being familliar with Haskell concepts would be good for programing culture and it would increase the odds of me being able to write Haskell professionally, which is something I enjoy a lot when writing hobby code at least. Having more access to tooling and a bigger eco system would be nice as well.

I’m not a 100% sure about my answer though. For one, I might grow to resent Haskell if I had to use it at work, and there’s also a risk that it would be harder to do cool innovative stuff with the language when more big companies depend on it.