Why is k3 the best reward for the awakening of all nations?

The national awakening says that the best reason for k3 reward is:

1, k3 reward includes seven pieces of wool paper, which can be exchanged for the kingdom treasure chest.

2. You can get a variety of resource rewards, including wood, food, stones and iron ore. These resources are indispensable in the game and can be used to upgrade various buildings.