Mike,
I found an old article that lists several pros & cons of the two approaches that might help. http://site.streetissuecustoms.com/4linkFAQ.html

While they are both good, I prefer the triangulated as the panhard bar on the parallel 4-link allows the differential to swing in a slight arc from left to right as it moves up and down. On Jeep TJ's they reverse the directions on the front & back panhard bars (one right side frame, one left side) to keep things straighter as you articulate, but then Jeeps are meant to have big suspension travel. With IFS you would see a bit more mis-alignment as the suspension travels (front stays straight, back arcs a bit), and I am interested in keeping things going straight where I point them and not introducing lateral movement that can be avoided.

If sold on parallel bars, a Watts link will eliminate the panhard bar if you have room behind the diff to install one and don't mind the look.