Generally speaking, therapists are not supposed to give a relationship advice, so if you mean just exploring your relationship in your individual therapy or doing a couple's work with a divorced therapist, yes, I would consider. Being divorced doesn't necessarily mean you are not good at dealing with relational problems, as divorce is not necessarily a relationship failure, it may be a good thing in terms of personal growth. It all depends on what was happening, how the divorce proceeded and what lessons were learned.

So, yes, a divorced therapist may be just as good at couple's work as a married one.

But I do understand the concern. Sometimes it does happen that a divorced therapist may still be struggling to process their divorce and hasn't yet made peace with it. In such cases, therapist often has an unconscious (or not so unconscious) agenda for his or her clients and they push their agenda sometimes implicitly, sometimes explicitly and aggressively, and this is not good. I've seen such therapists and they are doing great disservice to clients IMO. They are projecting their personal issues on clients instead of helping them to clarify their issues.