I categorize my hubs into two categories based on their popularity: (1) hubpages popularity and (2) search engine popularity. Why? Because not all my hubs that get a lot of HP traffic get organic traffic and vice versa. My most popular hub with 11,000 views has less than 250 HP views.
Hubs written about hubpages will always see more hubpages traffic. These hubs include HP tutorials, milestones and personal experiences. Human interest, General tutorials, money making/freelancing, recipes, health and so forth will follow.
As for search engine popularity, it depends on your niche but basically (based on the fact I write on may topics) health related articles, money making, recipes and travel are tops.