You might want to consult a couple more of the real estate market value of your home. Most of the estimates should be in the same ballpark.
It could be more honest with you about the value of your home and being your friend gave you a higher number because he already knew the other Realtor, it is expected of you. This is called “Buying a listing” and the subject of an article on our web site.
Or it could simply be that your friend is a good friend, but not that great of a real estate agent.
Mixing business and friendship friendships are always risky business. On the other hand, if your friend truly was providing competent and wise advice, she may be offended if you ignore the advice and choose another agent.