Straw- I am just a student of Smsmith, Maya, and Crazy Ed. Please chime in here fellas. I believe these guys have forgot'en more about fruit trees than I will ever know!!!
IME - Crab apples are very forgiving with regards to growing and the deer love them. In my area, Dolgos are bullet proof. Everything eats the fruit (I have witnessed coons, grouse, pheasants, squirrels, and deer eating them), they grow relatively fast, disease resistant, cold tolerant, and once mature put down a bunch of fruit. So why didn't I plant 10 of them right away...because I made it too complicated. Go figure, an engineer making it to complicated :rolleyes:. I would look around your area and see what is native or what others have planted with success. Then copy that. For deer, KEEP IT SIMPLE. 2-4 different species, planting a couple each year over as many years as you want. Which brings up another thought, better to plant less trees/year and take the time to cage, screen, and rock.