Seeing the stacked bolts gives a much better view than the 1/4" x 2-1/2" shown in the other pictures. And especially better than just the edge of the fabrics plus the outer strip shown in the top picture! Plus that is actually 1/2 the WOF so it is truly a clear picture of what you would be getting.
Also a pinked edge while at least theoretically reducing fraying, does not give a straight edge for matching up to the next piece. Definitely like the straight cut better too.
And yes that would be a great selection for a jelly roll!!