Card sorting: Use labels, or examples?

When running a card sorting exercise, would one receive better feedback by asking participants to group cards showing similar labels, or similar examples? I'm seeing both recommended. When using examples, let's assume that the participant is encouraged to ask clarifying questions if the context is unknown.

Labels:

Name

Age

Job title

City

Mobile Number

Height

Examples:

Maya Long

34

UX Designer

Santa Clara

(555)555-9736

67 inches