Help needed for my son

Hi everybody this is totally off topic but I would like some real help . My son will be graduating from high school this year . He loves programming and he is thinking about doing a mobile app development course ( https://www.cestarcollege.com/courses/technology/mobile-application-developer/ ) in college . He is thinking about doing either android or iOS. Which among the two has more job opportunities? It would be great if anybody could share any insight on this. 

he got a lot of time to think about it

I would seriously suggest that you allow your son to live his own life and let him follow his own heart.

Which one is he better at?

Not sure but he's a good track. 

.....Looks like this. Gamblers can see peaks and valleys just like equities. 

I can see it now, "Son, the biggest losers of your generation recommend that you blah blah blah blah blah"

hope he succeeds