Go Trojans!
He’s only in 10th grade. Visit all those schoools plus more, and decide where to apply after he figures out what he wants to study and which schools he likes best. Then decide where to go after he finds out where he gets in - which could be April 1 of senior year for USC. If he is a strong student with good test scores, he can get into all. I would absolutely pick USC over the other two, but I am biased.