Apples & pears are KINDA like food plot choices... You really need to diversify for lots of different reasons. It's not quite as drastic as say "greens VS grains" for foodplots but still, for sure not ONE or TWO go-to's. The other thing that's kinda a reality too....
A few off the top of my head, mentioned above. I for sure stagger towards: disease resistant and also later ripening. But, I do diversify with some that are earlier ripening and also not as disease resistant, lower quantities. Also, root stock is important and I'm sure most are going with: MLA-111 and Bud-118. That's what I'd do. Remember, stuff you buy from a garden center is going to be a small tree that is meant for your yard, not your farm. The problem with those: they need lots of support, more prone to root sucker, other problems & do not do as well on clay soils, etc, etc.
For apples, I think I probably have 15-20 varieties but ya, I like above.... Goldrush, Arkansas Black, Querina, Galarina, Liberty, Enterprise, Nova Spy, Hardy Cumberland, fuji, granny smith, etc, etc. Pears: Kieffer, Olympic, Magness, etc. (then, don't get me going but of course I'm adding persimmons & chestnuts which grow well in my zone). I ain't gonna straight up say it but I might have a SLIGHT leaning towards preferring pear VS apple. I still do more apple but I do as many pears as possible.... I personally think they are more hardy, deer preference MIGHT be more towards pear (?), etc. They do not drop as late though & less selection. No doubt, I'll do both.
OH - couple other things, no doubt, load up on crabapples & possibly a pollinator like Winter Banana apple tree. More pollinators the better and those 2 are excellent and are also great food. Oh, and if I just spoke "reality" - if you really want to make a difference with trees... You really are going to need, 10, 20, 50, 100, whatever. I'm not saying "don't plant 4 trees" but it's not going to be a huge difference or impact to a farm. Plus, you need to keep in mind, some trees may die, it takes a lot of trees to produce major tonnage, ripening variety, etc. Not saying everyone is able BUT - if I owned say, 80 acres, ideally I'd have 50-60 apple & pear trees.