I'd pick a character breakfast, personally! I think you get a lot of value from using credits on that, as well, and it gives a lot of variety usually and you get great photo op's with your fave characters.
This could be: Crystal Palace, Princess Storybook, Cindy's, Chef Mickeys, Ohanas, 1900 Park Fare, etc.
I would choose the one who has the characters you most want to see, and the food that looks the most appealing =)