Malcolm,
Played Mosholu with my son a bunch back when he was younger. I love 9 hole courses, golf club history, and my home course in Philly is Cobbs Creek, but Mosholu is, well, not so great. Very little left of Stiles and Van Kleek. The practice facility was the first priority when they redid it. It is a unique place so it is worth a play. It will play slow as beginners are the first priority with First Tee of NY being there.
Pelham and Split Rock, which still have much of the Stiles and Van Kleek, and have been written about a bunch here are pretty good. Pace of play is the only issue.