We just back from wdw and did both of these for our dd birthday. They basically serve the same hot meal at both of the breakfasts. The menu includes link sausage, some type of potato casserole, scramble eggs, bacon, oj and coffee. The only differences are Norway gives you cinnamon rolls and fruit before your meal and Cindy's gives you a variety of baked goods with fruit before your meal. They also have biscuits at Cindy's. Also, Cindy's gives you a choice of the hot meal above, or a cold meal which would include fresh fruit and some type of yogurt. Probably more than just yogurt but we all got the hot meal so cannot remember all on cold menu. As far as food quality and taste, I, as well as all in my group, enjoyed the meals.
As far as the atmosphere, they are different but to me both good. Cindy's is pretty cool because of the caslte. I have been to wdw over 40 times and had never been inside the castle. So that made it neat. Norway was very enjoyable too.
At this point, I am not sure which I would choose to return to on the next trip. I guess we would leave it up to dd. I think I would go ahead and do both and the next time you can decide which you prefer.
Hope this helps.
wdwdawg