Vigor is often expressed as the length of new growth each year. For a non bearing young tree new growth will be a lot more than on a mature bearing tree. For apple I'd want 3-4ft on a young tree and ~12 inches on a bearing tree. Your climate would support less growth particularly on a young tree than mine. I don't need to be concerned about winter damage and my growing season is two months longer.

The stone fruit can grow a lot more than apples or pears. In some climates there could be 4-5ft growth even on moderate vigor bearing trees. I try not to get that much and summer prune if I do.

Here I like a mature peach to have most one year shoots in the 12-18" range, evenly distributed throughout the tree. On a moderately vigorous tree between say 5 and 20 years old there will also be some more vigorous water sprouts that I would want to be able to remove entirely. If there is an inadequate supply of right sized shoots I will stub cut water sprouts to a couple of inches to encourage more shoots the next year.

Apple trees are more difficult to specify because they have such a wide range of growth habits, fruiting habits and rootstocks.