I've done both, but prefer scrappy. I've done both the random scrappy and controlled scrappy. I say control because I will pick 3 or 4 colors and use scraps of those colors. I think it comes down to your viewpoint of quilting. Some look at it as an art form and they plan. I look at quilts as utilitarian. My family quilts were all scrap quilts, pieced with whatever was available. In the 1800's and early 1900's the planned quilts were done by wealthy people who could buy fabric. The mother living in the one room cabin on the prairies of SD, who needed a blanket to keep her children warm in winter didn't plan anything, just used what she had and most of the time it was used fabric.