We have tried both princess breakfasts, several times as a matter of fact. I personally like the one in Norway @ Epcot.
In Norway you begin the meal with sliced fruit and muffins. Then they bring out a skillet with eggs, a yummy breakfast potato with cheese in it, and bacon and sausages. You may request seconds, or thirds on anything. The princess come to each table for a photoand to sign autographs. We have seen Mulan, Belle, Snow White, Aurora,and Jasmine.
At CRT in the castle @ Mk you are given fresh fruit and muffins. They then serve a fixed plate to each guest with egg, potatoes, bacon and sausages. You may also order a yougurt and granola plate (which we have never tried.) You may ask for seconds if you would like. The princess we have seen include Alice, Cinderella, Mary Popins, Aurora, Snow White, Bell and the Fairy God Mother. The characters visit each table for photos and autographs.
CRT is very very hard to get PS's for. You MUST call at 7:00 am.m exactly 90 days before you want to eat there. The Norway breakfast is a little easier to get PS's for but they are necessary!
You will enjoy either breakfast. Hope this helps with making your chioce. If you have any further ??'s please let me know.