Poptime,
That's a fair question but not sure your son will get the answer he is looking for.
All players have to work for their position, regardless of where you attend. And a lot depends of who stays and who leaves as well, who is injured, who is not producing, who is, etc. As we have said before, MOST freshman are not starters, no matter where they attend.
Your son just needs to go to the place he will be happiest at, learn that college baseball is different than the HS experience and be the best player he can be. He alone is the ONLY one who can guarantee his playing time.