Thanks for the thoughts so far.
It seems to be a question without a clear answer, and/or not a simple answer. So that is not very satisfying to me!
So, for example, if I'm looking for a place to plant my strawberries next year, or two apple trees, I want to know whether it is worth the extra effort to find a spot that will give 8-10 hours of sunlight; or if there is a convenient and easy to plant spot that gives 6-7 hours of sunlight, whether the result will be the same either way.
