You’re practically asking if you should write your work in French or German. Both are valid artistic choices, but one’s probably going to come more naturally to you.
I do have one idea that you might enjoy though - if you write from both of their perspectives, you could have one woman view everything through an idealistic lens, while the other has a much more grounded view? That dynamic might take over what you already had planned a little bit too much but I thought it was a neat concept.