I know there are those who claim FOB AUDs are better than matrixes. I am not one of those people.
If the FOH is competent/the board mix includes most of the instruments, I'd take matrix every single time. It's just less unpredictable - less guarding your stand, less chance of some idiot talking under it. You know the SBD won't have an idiot talking in it, no matter what else happens.
Obviously onstage+SBD is ideal, and I've done it by just running a long cable back (taped down carefully). But if not, assuming the SBD is a fairly full mix, I'd take the matrix.