This is a good question. Most of the time I buy the fabric called for by the pattern or book I am using. I think they would know. Then I buy if I like it. I don't like rough fabric no matter how expensive. Names don't mean that much I guess but I love McKenna Ryan , Mark Lipinski, Kaffe, Moda, any batiks (my love), etc. SO , this is how I buy. It would be nice to know to tell the difference. Kind of like sheets, I buy the ones that would look nice on my bed. If there is more thread great, if not oh well, softener can handle that.LOL I also find I do not have to pre-wash the fabric I chose. I have never had colors blend or more shrinkage than I like. I like to get that soft wrinkle look that ages a quilt. Happy quilting