I feel like you could ask this question 100x and all 100x you'd get a zillion different answers. We usually do breakfast in our room so the only notable breakfasts out and about on property have been Ohana, 1900 PF and Boma.
Our favorite was Ohana. Ohana is great since it's all you can eat but the food is served family style so you don't have to contend with a buffet line. We really enjoyed the food, it's basic breakfast fare which is fine by us and we love the Poly. Boma is definitely great if you enjoy a big variety of foods to try and don't want to be locked into just the usual breakfast foods. We ate there this past March and there were two African dishes on the buffet for breakfast, they were pretty good but the rest of the breakfast is pretty much standard american breakfast items- pancakes, bagon, eggs, waffles, toast, pastries, cereal, etc. I am just not a fan of buffets and waiting in line for my food. We also had really slow service when it came to refills and paying the check so that's why Boma is last for us. If you don't care for characters I'd recommend Boma for ya'll. 1900 PF is good, but I find that restaurant to be really really loud.