What I'm finding in my realm is that most of the time my Master knows best, and I prefer to be sub.
But sometimes I know best. Master doesn't like to switch out of masterly mode with me, I don't think, but eventually does it anyway, because respect is involved and we take that very seriously. Mutual respect is paramount to D/s relationship. Otherwise you just have another abusive or codependent relationship. She is very equitable and fair and loving, and we both want the other to be the best we can be.
At least that is something I'm discovering about D/s, the necessity of respect, switching or no. I don't actually know how I'd be as Dom physically. Still one of life's great unknowns for me.