My opinion of course.…
As a previous post has pointed out, he won’t join lacrosse till after basketball is over.
Prevailing opinion is that he will not start on the basketball team, and is being recruited to basketball to be basically a practice squad player. (Everybody looks great in their high school highlight videos).
Just the time commitment and keeping up academics in both sports will be absolutely brutal. I understand the attractions offered by the bright lights and hype surrounding big-time, big dollar College Athletics.
I would advise him to stick to lacrosse.
Or choose basketball.
If it matters, I think his chance of getting back to a final four is better in lacrosse; but this latter point is of course unknowable and certainly debatable.