You have many things to consider when choosing an agent to help you purchase or sell a home, but the very first one is this:
Choose an agent who is familiar with the area where you plan to buy or sell.
It's easy to be lured by fancy advertising, and it's easy to give in to pressure from friends or family who want you to use someone they know or love. But if that agent isn't familiar with the homes in the area in question, you won't get the representation you deserve.
First – the listing. Your agent needs to interpret sales data to determine the proper price for your home. And while it's true that the numbers are there in MLS, if the agent has never seen any of the homes in question, he or she won't know if they are comparable to yours.