AHA and BHA exfoliants serve similar purposes but differ in their area of focus and chemical structure. AHA exfoliators, like glycolic acid, work on the skin's surface and are water-soluble, making them suitable for dry and sun-damaged skin. BHA exfoliators, such as salicylic acid, are oil-soluble and penetrate deeper into pores, making them ideal for oily and acne-prone skin.