We usually make rope drop on our park days since we can get so much done in the first hour or two that the parks are open. For the occasional sit down breakfast, we like the last seating at a restaurant in the parks, Crystal Palace or Tusker House.
So I pick Boma for dinner. As others have said, there is a great variety of interesting food and the ambiance is cool, especially when the staff are drumming!
We've had breakfast there, too; it's good food, but there is lots more of it for dinner.
Have a great meal, whichever you choose.