Will S is 100% correct in stating that quarter sawn wood will reduce lumber yield and labor time. But my wood is almost always quarter sawn, for one because I use a lot of it for furniture and I don't want it cupping and becasue it's my wood. If I was in the business of selling wood and getting the most for my money, than yes I would flat saw it, more yield, but I'm in the business of making furniture, and I don't want to be ripping boards narrower to stop them from cupping.
Some woods the only way to cut them is quarter sawn, white oak is one, to get the best look of the wood.
So really it all depends on what you are doing with the wood, selling it for a living or as a consumer in making a living as to what is best for you.
