The quilt under construction right now has open seams in one direction and to one side in the other. Having both go to the side would have made a bulky mess. I thought "the rule" was to ALWAYS press to the darker side but a recent article debunked that rule.
I am free - lol
I suppose that it also depends on how one plans to quilt the piece. I wouldn't want to do in-the-ditch if the seams were open.