We booked both for our upcoming December trip as well. We originally were going to book just CRT because my DD6 really wants to eat there (the last time we ate in there she was 2, so she does not remember it). Then, out of the blue, my DH said that we had to book Akershus too because that is our Disney Tradition. So we are doing CRT for dinner on our
MVMCP night and Akershus for breakfast (got an 8:05am ADR before the park opening). However, for your question, we like Akershus over CRT. The character interaction is much better than at CRT. All the Princesses really take time and talk to the whole table. Jasmine (who is my DD8's favorite Princess) asked my DD to sing "A Whole New World" with her because my DD told her that she was her favorite....it was so sweet and my DD was on cloud nine for the whole day. Plus Akershus is a lot cheaper than at CRT, but if you want to have the experience of eating in the Castle then definately do it, I always say it is worth trying once.