Kindly tell which is the right preposition?
My husband and I argued over our daughter's education.
My husband and I argued about our daughter's education.
However, with something physical which two people want, then I would use "argue over". For example:
There is one slice of chocolate cake left. You want it. Your friend wants it. You both want it a lot!!! At the beginning it's friendly but after a while, it's not so friendly and you and your friend start to "argue over" the last slice of cake.