It doesn't matter.
The work just needs to be good. If you search long enough you'll find that there is no real answer anyway.
For example, SCAD had a portfolio review in Houston a couple years ago, and out of all of my work they said my best piece was a page of 2 minute gestures.
Later on, when I visited SCAD, they had a presentation on how to put together a portfolio. The speaker was adamant that SCAD wanted fully rendered works of art. She specifically emphasized that they did not want to see any sketchbook material.
Two SCAD representatives giving directly contradictory information.
Again, it's not hard to get into most any art school. Just pick your best 10 drawings and submit it.
Patience is a virtue, but who wants to be virtuous?