Granny Smith, Honeycrisp, Rome Beauty and Golden Delicious apples are good choices for making apple pies. Each of these has a sweet and tart flavor and a resilient texture that stands up to baking.
Granny Smith apples are more tart than Honeycrisp and Golden Delicious apples, which tend to be sweeter. Gala, Pink Lady or Cortland apples are acceptable substitutes in case the Rome Beauty is not available.
Apple recipes sometimes call for only one type of apple or sometimes require a mixture, such as Golden Delicious and Pink Lady. There are no hard rules about which method is best, but apples with firmer flesh survive the heat of baking better than others.