One fat bit of trivia to toss in like a monkey-wrench... GPUs prefer tris.

(Still prefer the thing in quads, though... makes 3rd-party morphing easier to happen (even though most folks are lazy in DS these days and use collision, custom morphs are still quite useful). Also, I suspect it makes the texture/normal/bump/spec maps easier to work with for folks who do add-on textures (not 100% sure, but I suspect it would be..)