Baseball players, for years, have either been superstitious about using certain gloves they use, or they use them for their simple function that helps bring confidence to their game.
Most pro players use sleek designs that aren't bulky by nature. Kip leather is a popular glove because it is smooth thinner yet still top off the line when it comes to durability.
Size and shapes of the gloves usually are picked either by position or simple preferences.
First baseman’s and catchers are fairly limited to what they can use so they have slim pickings when it comes to option, but for good reason.
Starting too far from a durable glove as a catcher would make it less durable and almost unusable. For instance, catcher's gloves don’t make an h-back webbing, which is used primarily for infielders to help sift dirt through the webbing to keep from grabbing dirt and not the ball.
It would simply be a liability for a catcher to use an h-back because of the loss of integrity of the webbing.
Outfielders would use a longer glove with a deeper pocket than most players. Outfielders want gloves that are designed to keep balls in the glove, not worry about making frequent transfer plays like infielders.
Third baseman’s have more of a hybrid glove that is sleek with a deeper pocket than a middle infielders glove but not quite as deep as an outfielders. Playing this hot corner requires a pocket that will have some sticking power. The fingers are not quite as long as an outfielder's glove so the ball can easily be found to still be quick when needed, such as turning a double play.
First baseman’s gloves are also durable and not a lot of wiggle room for design. They will take a beating not as much as a catcher's glove but a close second. They are typically longer and the only glove that does not have fingers on the field that you may want in the outfield but is against the rules. It is extremely durable to allow for many in-game picks with its shovel-like look.
MLB players use the best leather, not always the thickest because they want Ferraris on their hands, not a Rolls Royce.
Bulky is bad, so most players tend to move to the smaller size. Most young players like the extra cushion but professional players have much stronger hands so the less leather, within reason, the better.
So when searching for gloves look for Kip leather glove. It’s preferred by professional players.