I usually by yardage or fat quarters when quilting, although I have several layer cakes, jelly rolls and charm packs on my "want" list. I think it is a toss up between the layer cakes and the jelly rolls for me....ok probably the Layer Cake. I can always cut a layer cake down to the charm size, and I typically need triangles, squares, etc and not strips (and it always seems I need a 3" + sized item so cant cut that from the jelly roll). I think they all have their places, but for me the Layer cake is the best fit when dealing with pre-cuts.