as mentioned, it depends allot on where the blank was cut out of the stump. the closer to center cut, (relatively small growth rings showing) the more it needs to be plain sawn for good figure to show and the more likely it will exhibit good figure on only one side of the stock. quarter sawn certainly has it's advantages in stability and in certain walnuts, specificly english and french, QS will reveal the best attributes of the wood, the frequency of that dark-light marbled grain structure and the amount it is intertwined. the further away from QS you get the less frequent the intertwining will be until, at fully plain sawn, it shows more or less as strips along the full length of the blank instead of that intertwined marbled effect. bottom line, a really good piece must be cut out in an orientation that exhibits what is desired. the side effect is, of course, cost from yield. some sawyers will cut for best volume over cost and some will cut for best appearance with less yield.....it all depends on how deep your pockets are and whether or not the sawer wants to get good blanks or allot of blanks out of the stump. the more mineral in the grain the higher the desire to make money off of it.
maple generally yields better figure plainsawn and planks closer to the outer circumfrence of the tree will show it best. the compressions that cause the figure occur radially and when quarter sawing you don't cut accross the compressions as much as when plain sawing. i believe that is the main reason hard maple was used as much as it was, besides it's abundance. plain sawing is not as strong through the wrist, so hard maple was chosen to get good figure from plain sawing and better strength from it's density through the wrist. the soft maples being relegated to the plainer, straighter grained stocks destined for the trade guns.