So. This was a trip down the rabbit hole. I began this discussion 29 days ago. I finally made a decision tonight, and that was, in part, due to running out of time.
I've looked at pretty much everything everyone suggested here. I found it pretty much impossible to make a decision. In part because a knife is a very personal thing. But also in part because I found myself comparing everything to my own EDC knife (Victorinox One-Handed Trekker w/ serrated blade.) What I discovered about myself is that I really like my knife! So that made it difficult to buy my son something "less than." (Although, I also discovered faults with my knife as well.)
At any rate, I ended up buying him a Victorinox Tinker. Simple. Basic. Has what you need. Doesn't have what you don't. Small enough and light enough to carry all day every day in a pocket. I would have preferred a locking blade, but that wasn't in the cards.
Thanks to all who chimed in.