Bob, Im interested in old apple varieties. I fondly remember sampling green apples in my youth, the small sour unripe hard pingpongs. Loved them. Kept sampling until time to get the bushel basket and pick, load into gardenway cart and head to kitchen.
These days I love a hard Mac or Cortland. Most of the Golden Delcious types are too sweet for my preference. Do like Pink Lady. And Granny Smith.

Figure someday to have an orchard filled with nany varieties to taste test.

Rhode Island Greening might be like Granny Smith. IDK.

And praying for a repaired insulin system that will allow an apple a day again.