We just came back from vacation, but we have eaten at both several times.
As nice as the Princesses are to visit with in Akershus, they dont stay too long, enough to sign and autograph and take a picture. The food and the interaction with the characters was much better at the Garden Grill. Chip and Dale, Mickey and Pluto spent A LOT of time at our tables and came around 3 times and stopped each and everytime to act goofy or give a hug or hi-five! Chip and Dale were also goofing around calling each other nuts in sign language, and made my daughter laugh and laugh. The food was delicious, I really enjoyed the big family style salad and we actually ordered more of the turkey and the rice (which came under the Mahi-Mahi).
The food at Akershaus was tasty, I had the chicken, but I prefer the Garden Grill for the atmosphere and character interaction.