Who said anything about coolness? Seriously, why do people think that just because all languages are Turing complete, any further discussion is just a popularity contest?
All other things being equal, sure, choose the maximally powerful language in whichever dimension makes sense. But all other things are usually not equal.
If you are working on a project by yourself, here are some things which are more important than the characteristics of the language:
- your knowledge of the problem domain
- your knowledge of general software development
- your knowledge of the limits, capabilities and ecosystem
of the language (aka project experience)
- your customer's expectations (if you're shipping software to them)
- the ability to recruit experienced individuals for your project
- the availability of mentors / reviewers within your organization
- the availability of secondary resources (books, FAQ, etc)