Faith rune word question

I have a superior GMB and a non superior Matriarchal both +3 and both have the correct slots. I think I am leaning towards using the Matriarchal for my merc, is this the better decision or should I hold out for a superior Matriarchal (or should I just use the GMB).

again this is only for my merc as I would like to continue to use a my WF.