I really don't have a favorite. I mean, there are yarns I prefer, but mainly because they're the most inexpensive and the easiest to find (Red Heart SuperSaver, and Caron Perfect match)...... and the thread I prefer (again, mainly because I can find several sizes of it, albeit in only 2 colors, white and ecru) is Coat&Clark Big Ball. I would really love to try working with some locally hand-spun yarns. But I don't really know where to find them, and probably don't have the money to buy them anyway. --Kati