If you are looking to buy a home, condo or vacant lot in the Park City Utah area then you should definitely consider working with a local Realtor. There is a separate Multiple Listing Service that only local real estate agents would have access to. Other Realtors in Utah who are not members of the local Board of Realtors do not have access to this MLS information.
For buyers the benefit is that they have quick and easy access to the current listings when working with a local realtor. Their local Park City realtor will have access to pending sales data and sold sales data so they can provide their buyer clients with a better quality comparative market analysis for the property they are considering to purchase.
So a local real estate agent is better prepared to help their buyer clients negotiate for a better price with more information at their finger tips and they know whether a certain price is fair or not.
For sellers the benefit is that your property will be listed on the Park City MLS when working with a local Realtor. If you choose an agent who is not a member of the board then your listing will be limited in exposure, will take longer to sell and you will more than likely get less money for your home with the limited exposure. The more buyers that a listing is exposed to the greater the chances a listing has at getting top dollar. Many local realors participate in the Wasatch Front MLS near the Park City MLS so that their sellers can be on both to increase exposure through the state of Utah.
The Local MLS is expensive to join so that is why non-local agents do not participate.
Do not sell yourself short if you are buying or selling real estate in Park City Utah and use a local realtor.