You are describing two pitchers that have not played one college game yet and you have to stop obsessing that you feel that the player who gets more W's is always the better pitcher. Technically at this time he may be, he may be even better a lot later on, a lot changes over the course of a few college years. But the fact is that the 87 may just reach 90 (or never) and the 90 may reach 93-94. I am just wondering, which player has the looser, easier delivery?
Most guys that throw harder are not as accurate as those with slower velocity. Hopefully with proper instruction they will, but they have one thing that the other guy doesn't have, velo.
Your son has been given a great opportunity, hopefully he will mature and get an opportunity perhaps at a better D1 than the other guy.