The Short Answer: A Tart-Sweet Mix Works Best
The best apples for applesauce are varieties that break down easily, balance tartness with natural sweetness, and don't turn watery or bland when cooked. No single variety is perfect on its own — applesauce made from a mix of two or three kinds almost always beats a single-variety batch. The tart apple provides structure and brightness; the sweet apple rounds it out without needing added sugar. If you only have one variety to work with, Granny Smith and Golden Delicious are the two strongest solo performers, though they work even better together.
At Fisher's Fruit Farm in Brockport — about 25 minutes west of Rochester — all three of those varieties are growing right now. Mid-September is exactly the right moment to pick for applesauce: the fruit has full sugar, the texture is firm enough to haul home without bruising, and there's enough of the season left that you can go back for a second run.