If you wanting to see only princesses, Akershus is the best IMO. I have always found that they spend more time with the kids then CRT. You get to meet 4 princesses. We always saw Belle at the door with her ballgown, then Cinderella, Aurora, Snow White and ariel. In the past we've also seen Alice and Mulan but that was 4 years ago.
1900 PF is great. if you don't mind only seeing Cinderella, the Prince, the step sisters and Lady Tremaine at dinner time. The step sisters are a riot. They will scream because you took their dessert from the buffet or simply because they feel like it. My dds manage to get lady Tremaine to smile, she actually turn around to smaile as she tries to keep poker face and one of them danced with the Prince.
One more thing, at akershus you have a photo with Belle included just like CRT but at 1900 you need to pay for it but no character is on the photo simply a back drop. Also 1900PF is a buffet ( a good one at that) but Akershus has a cold buffet and you choose your entree from the menu.