What I discovered long ago, when my seams were not as accurate as they later became (with practice), was that some of the more expensive brands were more forgiving of my sewing inaccuracies. Meaning that, if the patchwork wasn't perfect, when I took it over to the ironing board to press the blocks flat, with a little steam, with the better fabrics the pieces all melded together better. And the brands that I discovered that I liked for this reason - and still do - are Timeless Treasures and Michael Miller.