I don't see anywhere in the question that the gentleman and his wife are asking for a comparison between a Class B and a Class C so why don't you Class C'ers stop running over here because you have nothing better to do.We B'ers can handle his question very well without your negative help.
We have a 1990 Class B 170 for 2 people and have plenty of storage but we leave our large double kitchen sink and our bath tub at home and carry no unnecessary item that we don't need and we are not the skinniest people but we like each other. We travel and camp for periods of extended time. We use campground washrooms even if they are not a 7 on the cleanliness scale because we don't rub ourselves up against the shower walls. I can park it anywhere a car can park and not have a fear of driving it through New York city or Chicago.
In my Class B opinion don't listen to the naysayers.