"Someone still went through the effort of growing that tree(parent), the value of the tree goes down simply because you didn't raise it? "
The value is all on the buyer and what they want for the tree/seed. They both have their equal advantages and downfalls that dont outweigh the other in value conceptually. If the buyer is a bad farmer, the tree is their choice. If the farmer has quite the green thumb, the seed is preferable and could be grown to be better.
Time and personal value are what distinguish which of the two is preferable and again that is entirely situational.