Take my advice with a grain of salt...we went to Sci Fi 2003, both in 2009, and Sci Fi in 2011. Maybe you can guess my pick?
I actually really like T-Rex and Rainforest Cafe...I like the food and drinks at these places (guess I am in the minority?)...I would give the edge to food flavor and choices to T-Rex
HOWEVER, T-Rex is just a decorated restaurant with a lot of loud dinosaurs...you can ride Dinosaur at AK
At SciFi, you get to eat in a car as if you were at a drive in movie...it is just so cool. Sci Fi is also a nice, cool, calm break from the parks whereas T-Rex is loud and requires a special trip to DTD.