My wife is also a therapist and does pretty much sees the same kind of issues I do. I hesitate doing both partners myself because it's too easy for one party to feel the T is siding with the other person. There is also the possibility that the T may slip and say something to party A that party B said.
So, it works better for us to split the couple. If you can find a T who can perhaps recommend another T whom s/he communicates well with, that's probably the best solution unless you can find a therapis couple like us.
Good luck and remember to check out the "Consumer's Guide to Therapist Shopping" that's on the MS site. It will help you ask the kinds of questions to get the right one.