I don't know anything about thread count, dyes, etc. I know about weight. What is boils down to is that if I can choose between the light fabric and the heavier fabric, I'll will go with the heavier fabric every time. And since I have been buying online a lot lately I will avoid the Moda fabrics. And I LOVE Moda fabs and have bought a ton of them over the years. And it really makes me sad that I will avoid their fabs.