Im curious too

By “best genetics” I think you may be looking for are heirloom seeds. https://www.highmowingseeds.com/history-and-philosophy

Look for local seed swaps in your area. Can’t think of anything better than varieties that have been grown in similar soil/climate, and given time to adapt year after year Great way to meet good, knowledgeable people too

BAKER CREEK HEIRLOOM SEEDS https://www.rareseeds.com/