One-piece bats provide little or no give and have a stiff feel when contact is made with the ball. Due to the fact that one-piece bats have a very minimal amount of flex at contact, little or no energy is lost which results in more power. For this reason, one-piece bats are preferred by stronger players with above average bat speed such as a power hitter.
Two-piece bats provide more flex at contact with the ball. The two-piece construction creates a “whip” effect that results in an increase in bat speed. An increase in bat speed results in an increase in power. For this reason players with average or below-average bat speed such as a contact hitter, prefer two-piece bats.