Deer definitely have a preference on the apples…though I couldn’t tell ya what I have. We current lave 7 huge mature apple trees. Of which I guess there is about 4 or 5 different types. We noticed as the season progresses, they move from one tree to another. Again, Im guessing, butr I think it is the time of the fall in which the apples mature and are at peak sugar content. 3 of them are wild apple trees that don’t have good eating apples, but they cook up for apple sauce great. The flesh is nearly pure white and the skin is deep red. The others are ?? from a buddies orchard. Where he dumps his pulp from making cider sprouted a lot of trees. I dug about 50 of them up and transplanted. Bucks took care of rubbing about 30 of them up, my dad took out about 10 with the tractor/equipment, and the rest are just weird. One of them only produces apples every other year, another has golden apples that the deer won’t touch, couple have apples that never ripen. 20 years ago, I wish I would have bought 4 or 5 a year from a nursery and continued that tradition. On of my regrets with my farm.
Good luck!
BTW – I have a Bartlet pear tree in my back yard at my house. As soon as they ripen, the deer come about 500 yrds out of a wetland to eat everyone that they can reach!