Both these methods produce kalidescope blocks. To me a One Block Wonder quilt takes the fabric and reduces it to colors. Although you get beautiful blocks, the individual blocks are not important, it's the overall arrangement into a new fabric where the colors flow that counts. The individual blocks melt into each other. The Stack and Whack method highlights the individual kalidescope blocks that are created by surrounding them with other fabrics, making them the center piece of a larger block.