I personally love the Python environment and community. There is very little you ever need that you can't find a module for. It is also a very well adopted language that many developers know and is increasingly popular in education so the amount of people using it is almost artificially increased. Django as a framework is used by a ton of big companies and sites and has proven itself to be very scalable and durable. Node to me is horrible just because of javascript, so take my bias with a grain of salt ;)