As far as rootstock affecting fruit size and yeald , M7 gets the thumbs down on this score- 111 gets much better revues. Although I have a lot of experience with both rootstocks the relative quality and quantity of the fruit in a home orchard situation doesn't seem that important. With proper pruning and thinning both perform well enough but 111 sometimes takes about an extra year to bear.
On at least 2 occasions I have read catalogues of small fruit tree nurseries- Ames and Apples of Antiquity, that state a preference for trees on 111 over 7. These nurseries are on opposite sides of the country and grow trees in much different conditions. _______________________________________________
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