Hello Tray: Sellerâ€™s vs buyers (listing) agents is the essence of your question apparently.
All agents are licensed to buy and sell homes and most (90%) do, rather then confine them selves to one or the other. Maybe a better or more accurate way to respond to your question is based on experience or expertise. How do you attempt to pick a real estate agent. While I am a Washington State agent, I am prejudice about who to pick from the get go. First, pick a Realtor. Close to 45% of the real estate agents are not Realtors. Realtors must subscribe to a Code of Ethics and must be paid members of the US, State and County Association of Realtors. Start there.
Then, go for expertise. Play the odds. Find an agent with real estate credentials. Credentials = education. In theory, the better educated one is the better they can represent your interests. It is sort of like picking a physician for a difficult medical problem. Find one that is board certified and fellowship trained in a specialty field. Is the agent also licensed as a Broker? The CRS (Certified Residential Specialist) and GRI (Graduate, Realtor Institute) are also serious real estate educational commitments that can help define the difference in agent expertise. You will often find an indication on the agents advertising or card that they have these credentials. You can call a local real estate office and ask for someone with those credentials.
Big Producer? Might be good or bad. Some of the biggest producers never have time to answer your on-going questions. But, using an inexperienced agent can have much bigger drawbacks. Error on the side of experience.
Then, it is a matter of bonding. Finding someone you can work with comfortably.
Follow these guidelines and you will have your answer.