James, the best way to identify top agents for new builds is to leverage public MLS data and online tools
MLS Reports – Most MLS systems let you filter by ‘property type' and ‘status' (sold/new construction). You can then see which agents have the most closings in that category.
Zillow / Redfin / Realtor.com – Search for new build sales in your area and check the listing agent for multiple recent sales.
County/City Records – Many counties list recorded sales; you can track which agents are listed on new builds.
Network & Builder Contacts – Local builders often know which agents consistently sell their new inventory.