The choice of apple can make a significant difference in the flavor and texture of your crullers. Opt for a variety that is crisp, slightly tart, and holds its shape well during baking. Granny Smith, Honeycrisp, or Braeburn apples are excellent choices, as they bring a delightful balance of sweetness and tanginess to the recipe. Be sure to finely grate the apples to infuse the dough with their natural juiciness and flavor.