I would go to the autism expert. Reasoning: the gifted expert doesn't necessarily have the training to catch the fine points of autism. The autism people will be equipped to recognize the high IQ and academic achievement-- they may underplay these, but they won't omit to notice them altogether. The autism expert is more likely to use the full range of instruments for assessing social and language skills. Make sure they give the ADOS, which is a standardized test.

DeeDee