Requirements too vague to begin to answer the question. Choice of language generally has little to do with overall productivity, except you will need time to l

Requirements too vague to begin to answer the question. Choice of language generally has little to do with overall productivity, except you will need time to learn a new language, libraries, idioms, ecosystem. So best to start with the language you have the most expertise and experience with. The factors you discount can affect overall productivity much more than the programming language. Your question seems like asking which tires will let you drive fastest, ignoring everything else about the car and the road and your driving skills.