After testing over 200 community-recommended seeds, the absolute for the current patch (v1.2+) is:
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These seeds provide a balance of fertile land, stone, and iron, making them ideal for your first playthrough. best seeds for kingdoms and castles
This seed is terrifying for the first 20 years. You start on a small island with only trees and berries. Iron is on a neighboring island, and stone is on a third. You must build a port and ferry system immediately. Iron is on a neighboring island, and stone is on a third
: A solid choice for beginners, offering a large forest in the middle with all necessary resources nearby and excellent farming spots. Best Seeds for Defense and Island Bases Best Seeds for Defense and Island Bases Generates
Generates a landmass shaped like a boot, offering quirky terrain for creative builders. Tips for Finding Your Own Seeds