If you are thinking about planting apple trees, plant several varieties. I have honeycrisp, johnathan, yellow and red delicious, arkansas black, gala and winesap apples. I'm sure I'm forgetting one or two. This year the yellow delicious and johnathan apple survived the late frost this year and produced well. If you are wanting a good all around apple, I think you can't beat johnathan apples. They actually are my favorite for just eating. They are also good for pies and make execellent applesauce.
As far as other fruit trees, I have nectarine, pear, plum and several varieties of cherries.
As far as nut trees, I have a couple of hardy almonds. Then there are the walnuts, oaks, hickory and lots of pecans.
Then there is grapes, blackberries and raspberries.