I immediately thought "both" but as I've reflected on this question I realize that I'm probably more driven by the pattern. There are SO MANY lovely quilts that I'd like to make, so many patterns to try out that when I find the right fabric for a pattern, I make it. I've recently been on a buying kits kick which is new to me and now have a few of those to sew together which I guess still falls into the pattern category.
Great question. I enjoyed exploring my thought process.