This might be impossible to answer as birds, reptiles and some fish have been the only creatures to survive from the Jurassic period. I would assume parrots are more intelligent as they have found a way into our hearts and homes, I don't imagine a raptor would receive the same treatment over the last thousand years.

All joking aside, It really depends on how you measure intelligence. I think adaptability indicates a high level of intelligence, for example humans were able to adapt to changing climate and use tools rather then grow claws. Some birds are able to remember faces, sense emotions, recognize themselves, even use tools to acquire food, as well as migrate and communicate socially. This puts them right up with apes, dolphins and... us.