One will not dominate the other, just as the forces of yin and yang balance each other in the universe. The dragon symbolizes the yang forces of the universe. The tiger symbolizes the yin forces of the universe.
You would prefer higher cards to occur more frequently than lower cards in order to maximize your chances of winning the hand. Therefore, wait until lower cards have been dealt before playing. Players in Dragon Tiger have the option of counting their cards to avoid making a poor choice.