Lengthwise baffles are very effective in my opinion, in particular when ground sleeping there seems to be fewer issues with down shift whereas with crosswise or horizontal baffles the down can shift off your shoulder to the edges of the quilt if you move in the night. In a hammock the quilt is cradled and down is less likely to shift in any case.

See here for my design: http://bushwalk.com/forum/viewtopic.php?f=27&t=21674