Have you tried RJR solids? We carried both the Moda and Kona solids in our shop, but the RJR solids we had were better quality, IMO, and didn't fray as much. That said, I've used lots of Moda and Kona and still do. Also, Moda black is not "superior" to other fabrics. It just depends on the tone and depth of the color you want. There are double and triple dyed black solids out there. Try a few different ones and see which one(s) you like best. And, if you're like me, then buy the bolt so you always have black fabric on hand
Christine