This isn't the exact same question, but who would you save - A) Hitler or B) a person with an IQ score of 0-30?
For me, it's obviously the second person, at least knowing what Hitler is capable of.
Is he capable of living a richer, more reflective, more human, more meaningful life with a broader range of thoughts and emotions.? Sure. but I don't care, because he is evil. F*** him.
No, deciding these things based on IQ is a terrible idea.
Anyway, I'd save the gorilla. Gorillas are practically human anyway.