Let’s suppose I want someone to give me more money.
Now I can say to that person:
“You need to give me more money.”
“You must give me more money.”
The request is meant to be somewhat harsh.
The question is not about alternative forms of the request, but specifically about the difference in meaning (if there is any) between the two forms.
Is there a the subtle difference between the two forms?
I have the impression that “you must” is a somewhat stronger request than “you need”, but I’m really not sure.