We have services in both Python/Tornado and Node and to be honest for async backend services I kinda prefer Node, because in JS everything is async plus I find

We have services in both Python/Tornado and Node and to be honest for async backend services I kinda prefer Node, because in JS everything is async plus I find the dep. management in Python annoying. If it was my choice I'd use neither and go for Elixir which is a pure joy to use.