At breakfast and lunch, you'll find the number of princesses at Cinderella's Royal Table and the Akershus to be about the same. The only real difference is that Cinderella will not be at Akershus and Ariel will not be CRT. I happen to prefer the Royal Table for character dining because of the overall atmosphere. You can read more about this
HERE.
If it's volume of princesses you want, then you'll want to avoid the Royal Table at dinner. At this meal, Cinderella greets guests in the lobby, but the Fairy Godmother and mice are only characters in the dining room. Another princess-related meal is 1900 Park Fare at the Grand Floridian. During dinner, you'll find Cinderella and Prince Charming as well as Cindy's stepmother and stepsisters. The "steps" are quite humorous -- whispering about Cinderella behind her back. If you want some comic relief in your vacation, this is a good choice.
You can also find princesses in the parks. Try the Toontown Hall of fame in Toontown in the Magic Kingdom. Also, Ariel is always in her MK grotto. Mulan is in China at Epcot, Belle is in France, Jasmine is in Morocco. Jasmine is also sometimes near the Aladdin ride at the MK. Snow White is sometimes in Germany at Epcot or near Main Street in the Magic Kingdom. To find the princesses out and about, you'll need to check the free Times Guides, available near the maps at the park entrance. These will give the times of specific character greetings. If you're looking for someone in particular, stop by the Guest Relations office at any of the theme parks and ask them to call the "character hotline" for you. They will be able to tell you exactly where and when a specific character will be appearing in the parks during the time of your visit.