The type of dazzling basketball that a player will execute is contingent on the height and rating as well as the position on the court while performing the move. If a player is running from the baseline will result in a sideline dunk, while players running from the wings will execute the hammer with one hand.
Dunks that are dominant, or with an offhand hand performed by pressing down R2 or even RT and using the right stick to flick either to either left or right, while the player is running to the paint. The hand that the player will use for dunking will depend on the direction in which you move the stick to when you perform the action.
The impact and gravity of the shot will not matter if it's their dominant hand or the other hand when finishing. As long as the participant is able to complete the move, you'll score two points with elegance.