It's definitely debatable. You don't need to worry about returning to the upgrade location for the Castle – just take the Marksmen and run. For the Snow faction, building is extremely desirable – sometimes, instead of fighting properly, you end up running around looking for ore that was allocated to Gargoyles. But for the Swamp faction, I don't think it's critical.
As for whether you can build Griffins right away or not... it's very important.
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