The psychologist should write in the report which they consider to be most accurate for your child.

But WM and PS are there for a reason, they have an impact in life and I am inclined to think have a huge impact in early schooling - where advanced reasoning is virtually irrelevant to curriculum goals. So the FSIQ is probably most relevant to whole child functioning, but GAI and extended GAI a better measure of pure reasoning ability (readiness for thinking about advanced math v. being best in the class at learning times tables and writing them out at speed in weekly tests as a crude example)...