Others mention how pies call for different apples. In the same vein, my father's cousin, a farmer and now sadly no longer with us, had a strong opinion about apples that were best for applesauce. Sadly, I don't remember which variety. He lived in rural Ontario, Canada, and knew the only farm in the area that grew that variety, so that's where we'd go to buy apples when it was time to make applesauce.