Absolutely dinner! Not even close.
Dinner entrees are fantastic. Love the appetizer buffet.
Not feeling rushed to finish or missing prime touring time.
After walking around all day you'll be very happy to sit for a relaxing meal.
We've done both. Princesses were less rushed at dinner.
I'd do breakfast again only as a ppo adr, so we could get to foa ahead of rope drop. But that does result in pressure to finish and get out on time.
The breakfast food is good too, and it is recommended. Dinner is just better.
However, I believe lunch and dinner is now same price and menu? Not sure, but if so, lunch would be my first choice, so you get a mid day break from touring.