I realized I never reviewed CP or 1900 PF in my earlier post.
From the two listed, 1900 is by far my family's favorite, but that's also taking into account the characters, which I know you didn't want.

The two stepsisters were the funniest things! They chattered on and on, the evil stepmother was firm and serious, Cinderella was gorgeous, and Prince Charming was....charming.

Seriously, my "too cool" 14 yr old dd at the time was smitten-instantly! They took their time, posed for as many pics, etc. The steps flirted with my ds (who would've been 8 or so. He both loved it and was embarrassed at the same time!)
CP had good character interaction as well. I'm a little soured there though, bc the only character I wanted a picture with was Eeyore,

and he left me high and dry to go do the parade. He came back, but went to the next table.

Luckily, my dh said something to his handler and he did come back for a quick pic, but it felt rushed to me. Pooh gives the best hugs though!
Food at both was comparable. Nothing really knocked my socks off, but 1900 probably edged out CP by just a hair. Both kept the buffets nice and supplied. I do remember eating more from the kids buffet at CP than 1900, which means I must not have found too much variety for me at CP. (Loved that Mac n cheese and chicken nuggets from the kids buffet though. LOL) I remember CP had a bunch of salad-y kind of things: macaroni, pasta, etc. I'm not into that, so I went for the meat and Mac and cheese, LOL.
Atmosphere is very different between the two as well. 1900 does feel a bit more upscale, while cp felt very comfortable. We had a table tucked in the back for 1900, and it felt very crowded to me. CP we had a booth with 2 chairs if I remember correctly. It just seemed like we had more elbow room. Plus, the dining room at CP just seemed huge and airy.
Noise level seemed to be about the same at both too.
Akershus-other than the food-the atmosphere was ok. However, we were seated at an awkward table, and couldn't see the princesses when they first came out. It seemed very cramped and dark in there to me as well. We met almost all of the princesses before my son got sick, if I remember correctly. Character interaction was good there. Dh and ds were both smitten. LOL
That's probably more than you ever wanted to know.

Keep in mind this was all two years ago and remembered through my fibro foggy brain as well.

(And, of course, everyone has a different opinion/experience. I've read so many stories of people who loved Akershus that our experience just doesn't seem real, if that makes sense. )
We have plans to go back to 1900 PF this year, and I can't wait!