What kind of experience do you think is better?

This is a question I just wanted to see what employers would think about.

Which would you rather see in a nanny's resume, experience-wise.... More families, or longer terms of employment? So, for example....

A. 10 years experience with a single family

B. 10 years experience, but as 3-4 years with 3 different families?

This is just for fun, I'm just curious.