The quarter sawn neck has a distinctly brighter tone due to its density.
The Flat sawn neck tends to have a more mellow tone and is more pliable so it is better for use with vintage style, single acting truss rods and does very well with a hard finish but can also be left unfinished as well.
Aesthetically speaking, the wood grain is much more visible on a flat sawn neck as opposed to a quarter sawn neck. Flamey and Birdseye necks are most often flat sawn
