The best race for a paladin in Baldur’s Gate 3 depends on the player’s desired playstyle and preferences. However, there are certain races that are generally considered to be well-suited for the paladin class due to their racial abilities and bonuses.
For example, the Aasimar race grants paladins access to the Radiant Soul ability, which deals radiant damage to enemies and can be used to heal allies. The Githyanki race grants paladins access to the Githyanki Psionic ability, which can be used to stun enemies or grant temporary hit points to allies. The Half-Elf race grants paladins access to the Fey Ancestry ability, which gives them advantage on saving throws against being charmed or frightened.