Full button baseball jerseys and pullover baseball jerseys are the two main jersey styles commonly worn by baseball players. The two main differences are:

Closure: The most obvious difference is the way the jerseys close. A full buttoned jersey has a row of buttons down the front that can be opened and closed, while a pullover jersey is designed to be pulled over the head without any buttons or closures.

Style: Full buttoned jerseys tend to have a more classic, traditional look, while pullover jerseys can appear more modern and streamlined. However, this can vary based on the specific design of each jersey.

Fit: Because they have buttons down the front, full buttoned jerseys can offer more adjustability in terms of fit. Players can choose to leave the jersey fully buttoned for a more form-fitting look or leave it unbuttoned for a looser, more relaxed fit. Pullover jerseys typically have a more fixed fit that cannot be adjusted in the same way.

Comfort: Both styles of jerseys are typically made from lightweight, breathable materials that are designed to keep the player comfortable during games. However, some players may find the buttons on a full buttoned jersey to be uncomfortable or cumbersome.

Overall, the choice between full buttoned baseball jerseys and pullover jerseys often comes down to personal preference and team tradition. Some players and teams prefer the classic look of a full buttoned jersey, while others prefer the simplicity and ease of a pullover.