The two key elements to the perfect apple pie are flavor and texture. You want a balance of sweet and tart, without mushiness or mealiness. That’s why Golden Delicious and Braeburn apples, according to J. Kenji Lopez-Alt, of Serious Eats, have the best flavor and texture for baking.
Source: LifeHacker – Why Golden Delicious and Braeburn Are the Best Apples for Pie