Which combination is better to use python /flask with node.js or php with node.js for developing chat app?

The use of Python with Node.Js or PHP with Node.Js depends on the requirement of an entrepreneur with the app launch. Most entrepreneurs prefer only Node.Js instead of combining it with Python / PHP for the development of chat app.

Being a developer myself I would prefer using Node.Js only but also would not refute the combination with PHP or python because if need be it can be combined based on the actual user and entrepreneur requirement in a chat app.

If you are absolutely serious about developing a high-performing chat app, then the better option would be to consult professionals who are highly skilled and experienced in developing a chat app