We have done both. To me, if you have never done CRT, do it at least once. We had a far better experience there than I've read about on these boards. The food was not great, neither is Akershus, but you are eating in the castle, which is very cool.
Next trip, or next meal, try Akershus. They are both overated IMO, and my kids, but still fun experiences. I don't honestly think one is better than the other, but, again, if you have never done either, and can choose only one, do CRT just for the experience.