We stayed at the Poly and ended our trip there with the breakfast. LOVED it! We will definitely do it again. The characters look so cute in their Hawaiian attire!
We also did dinner there. I enjoyed the whole entertainment part, limbo, hula lessons, etc. but it was too much meat for me. I did love the shrimp, Lapu Lapu served in a pineapple (dangerously potent though!), and the "extras", just not all the meat. I don't know if we'd do dinner again, but not because we had bad service or the food was bad. In fact, our waiter was great and offered my kids different choices. And we walked down to the beach and watched the fireworks after dinner.
So I guess if I had to pick, I'd choose breakfast, but I think you would enjoy the atmosphere of either.
Angie