Do you prefer episodes featuring many different people, or an episode focusing on a single person? One of my favorite episodes is "God Bless You, Water Woman," because Joan Ocean is a treat. Clingfilm guy is a classic, too. The downside to a spotlight episode is if you don't like hearing about that person for whatever reason, the whole episode becomes less interesting to you.
This is something I've often wondered while putting together docs. For example, I could've easily made the audiophiles doc entirely about Patrick82, but decided to devote at least half of it to other people for sake of variety.