The gunks can also be different in that the anchor placements are often in a horizontal relationship (I know what you're thinkin' Smike), which tends to keep the arms of the cordelette more equal in length than in a vertical alignment. As such, there is less relative difference in stretch and consequent loading between the different elements of the rigging in a straight up or down pull. Obviously not true for every situation but more often the case than on some crack jam-fest.
This can work against you as well, as the side pull effect is then more pronounced on a horizontal alignment as the cordelette is essentially fixed in position against any wandering and will then load the anchor point farthest away from the pull much more than any other.