Ul ' dah , because Ul ' dah will be the single main threat on the main land . The difference between Ishgard and Limsa is that Ishgard can close the front door , locking out any Eorzean forces , while still having access to everything behind Ishgard . Doesn ' t matter if Ishgard does it as deffensive mechanism or because the attacking forces choose to destroy the bridge . Ishgardians are not trapped inside Ishgard . Locking Limsas population into Limsa Lominsa let ' s them go nowhere . What are they gonna do ? Build house boats and live on the ocean around Limsa , where they ' re easy targets ? Limsa has a lot of openings , but none of those openings is actual land , just a bunch of bridges and boat routes . Both easy to make unusabletoo dangerous for the regular folk to use .