Go to Superior Threads web site, http://www.superiorthreads.com/
and choose the tab that says "education". They have a lot of information on what types of thread to use and even a chart that tells you what thread to use with what needle, etc. The information is useful whatever brand you use.

Coats and Clark is way too linty for my machines. After reading several thread discussions on here, I decided to try Connecting Threads. I bought 2 small spools and it's less linty and so far my machines like it :)

Aurifil, if I want cotton for piecing; seams lie very flat.
Mostly Bottom Line, a very very thin poly thread meant for the bobbin.
I use it for everything
My Jems will only take it in bobbins; my Bernina1030 takes it top and bobbin.

i would not pay $70 for 100 spools of thread until I tested it with One spool

I think it's more about your machine. My Singer is fine with coats but my pfaff works best with gutterman. I keep some of all of it:)

yep, the C&C tends to shred and snap on my machine.

Guterman works great on my Janome as well.

I've used C&C all the years I've been sewing, and never ever had any problems of any kind. I do buy Mettler also, mainly because I like the smaller spools, I can store more. Never had problems with it either. I've also used serger thread when I needed too, no problems with that either. I've used all these on a FW, a Kenmore, and now 2 Janomes.

My Pfaff 7570 will take anything I throw at it with no problems. I mostly use Maxilock serger thread for piecing and quilting now. I know some people have said it won't hold up over the years, but I'm not trying to make heirloom quilts.

I really like Aurifil thread the best. Get a spool for $10 and it lasts! Otherwise I like the Gutterman thread. Coats and Clark seemed to lint up a lot on my machine.