You may already be aware, but apples don't grow true to seed, so the tree growing from the seeds of an apple won't produce apples that taste the same.
Good tasting apples are rare genetic freaks, so the tree making them has a branch cut off and grafted onto a other tree.
Apples trees planted from seed will give you a crab apple, unless you're uniquely lucky. If you're looking for crab apples though, you're all set!