It's my belief (and via practical experience) that most "decent players" - who can throw 275 feet and not have to execute a full throw - will miss "left and right" by more than they will miss "short and long" (especially if the prevailing wind is l to r or r to l). Thus if your goal is to have a "fair" but minimal-sized green, make it wider than deep (for equal dispersion of splash-downs).
This, of course, is for bh'ers and fh'ers; if considering oh'er (...and who might that be?
), the opposite is true (will miss long and short probably more than left and right).
Karl