Quoted from Mathazar:
STTNG is pretty ambitious for a first pin...lots of maintenance with the cannons, diverters, and optos in the subway. Unless of course he's got you to keep it running smoothly for him.
100% this; I'd strongly consider if this is the hill you want to die on Marine? Lots of 1st time owners get frustrated when machines suddenly stop working, and it turns them off of the hobby. STTNG is a favorite of mine as well, but it does constantly have issues and is out of commission regularly.
If he's a trekie; maybe the new ST from stern would be a better 1st pin IMHO