Thanks for clarifying the difference. But I think people are more interested in more straightforward questions such as which one is “better” for their use cases? Developers who have little knowledge about event-driven websocket programming just need to know which one is easy to use and easy to scale. Yes after reading your article I know SC can scale both horizontally and vertically very well, but that doesn’t mean socket.io can’t do the job. People like me just want to select a tool to do the job and do it fast. It will be better if there is some chart for performance comparison in certain use cases.