I have my own apple seedling, wich produce good fruits.
They are small to medium, not so juicy and my wife like them very much, because they are sweet / I prefer more acidity/.
In my young years we owned peach from seed, wich my grandmother get from our neighbors tree. This seedling peach produced fantastic fruits - very big, juicy and aromatic. The only disadvantage:- the pits was cling.
Years later the tree begin to die. Two years in a row I try to graft from
remained weak twigs to another tree without success. And it doesn’t flash in my mind, that I can save pits and sow them. I still regret for this. 
So, don’t trust every “fat book”, which say to use only vegetative
propagation. Now I sow seeds from almost everything, but how many
years are lost… 
I sow seeds mainly for fun and curiosity, but at the same time with hope
to create more long-living peaches and appricots, more hardy
persimmons, pomegranates and black mullbery and tasty apples.
I already have fruits from an apple, kiwi, schisandra, several Cornelian cherry, honeyberry, goji berry and Nanking cherry - all seedlings. Also have young seedlings from apples, serviceberry, goumi, jujube, black mullbery, chaenomeles, persimmons, feijoa, pomegranate and sorbus domestica.
I love growing plants from seeds!
It’s worth reading books about breeding from Michurin and Burbank.
Good luck!
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