My favorite is Aurifil. When I go to a shop with any kind of discount, I purchase a spool of cream or white Aurifil. I like the smooth fine weight that is strong and that doesn't leave a pile of fuzz in my machine. That said one of my quilting buddies does long arming and she gives me spool ends that will not be enough for a quilt or samples that her machine "doesn't like". What a blessing! I can piece away with the long arm spools, oh it is a bother filling bobbins, but free thread is free thread! I can then keep my Aurifil for quilting. Recently I got real bold and purchased a variegated spool of Aurifil. Now I need to pick out a good quilt that can accommodate the soft gentle blend off colors. Goodness, there is one under construction right now!