I do not believe there is a dominant partner in a healthy relationship. I am neither dominant nor submissive and he is not either. I would never be in a relationship that was viewed in those terms. But then I have always marched to my own drum.
Rather, I am stronger than him in some areas of decision making he is stronger than me in others. We know this and play it off. He has no problem with me saying:"this is how we are doing this" I have no problem with him saying: we will be leaving at this time, you will be driving for the first two hours...etc...this is the hotel we will stay at.
We know each others strengths and weaknesses and we are both aware of our own, thus things flow well, there is no dominant partner there are only strengths that are shared for the good of both.
We are both okay with that. But then again, partners that are super balanced are as rare as hen's teeth.