Hi, Jean! If it were up to me, I'd choose lunch, but that's mostly because my girls are not big breakfast eaters. It hardly seems worth it to me to pay such a big amount of money for breakfast, when they usually only want a bowl of cereal or a bagel at home. We get more bang for our buck at any meal but breakfast.
Having said that, with Cinderella's Royal Table, you sometimes don't have a choice. When you call in for your reservation, ask for the meal you want, but be prepared to maybe have to pick a different meal.
You can check the menus out for both meals at
www.allears.net by clicking on the Dining tab at the top of the page. That will help you make the decision that's right for your family.
Good luck getting the reservation you want!