Top Picks will follow most of the preferences that you entered on your profile. They also reflect your recent activity on the site, like who you've sent Likes and Messages to.
Top Picks follow your preferences related to faith, ethnicity, marital status, smoking, drinking, marijuana, body type, education, and whether your match has kids or wants kids. They use a slightly broadened range for your age, height, and distance preferences.
Your other Recommended profiles might not follow all of those preferences, but they could still be a great match for you! Click the Heart icon to send them a Like, or click the "X" icon to see your next recommendation.