Keep in mind, the faster the blade, the less control it has. Beginner players should not choose a fast blade until some of the basic timimg skills of the game have been mastered. They provide high speed and reduced control characteristics. Allround blades are for players seeking improved control while retaining some speed characteristics. Allround blades are most suitable for beginners.
Defensive blades are for players seeking maximum control.
It is also a personal decision, depending on what feels right in your hand. Most bats weigh between 70 and 100 grams before the rubber is applied. The number of plies vary from one blade to another. Five ply is the most common and most popular, being used by both the offensive and allaround player. The heavier seven plies are usually preferred by attacking players because they are faster.