Difference in threads?
 

I'm working on FMQ a quilt and am having problems with the thread. I've purchased thread from both Joanne's and Walmart, same brand but the spools are different. Seems like I have luck with Joanne's thread but things aren't looking so great with the thread from Walmart. Has anyone else had this problem?

I only use Mettler (cotton with a silk finish) and Essential thread from Connecting Threads. Both are wonderful and I've never had any problems with either. Maybe the thread you got from Walmart is older or was exposed to moisture - just some thoughts off the top of my head.

Go to superiorthread.com to find out all you want to know about thread and then some.

discountembroidery.com has exceptional prices on all kinds of thread.

it is important to use the correct needle with the weight/type of thread you are using- i agree with (z) to visit Superior Threads- they have a chart you can print off telling you the difference between the different threads- the needles to use with each type the project they are best suited for- and the differences in weights/fiber contents.
it is an invaluable resource.
and some machines simply do not like some threads-
it is also important to change your needle- either with every project- or after 8 hours of sewing -which ever comes first---it is amazing the difference a new needle can make.

Superior threads or Mettler or the thread from Connecting Threads is the best to use. My long arm is VERY cantankerous about what she's fed...as are a couple of the others. But then, I have several that don't care what they're fed, as long as they eat!

It may be the same brand, but is it the same weight and fiber makeup?

Don't use cheap thread, that is one of the best pieces of advice and quilter can give you. Guttermen, mettler, and connecting threads are all good quality threads. lot of people also like superior, king tut, isacord, and aurifil are also some reputable brands. Coats and clarks is not the greatest which is most likely the brand you are using

It is hard to tell how long and under what conditions that WM thread was stored. Thread can deteriorate from storage conditions. I would bet that is what happened.

Everyone is going to have different opinions about what thread is the best. I have used the higher priced threads at times but most of my piecing is done with Coats and Clarks Dual Duty XP All Purpose 100% Polyester covered Polyester and I have had no issues with it. There has been scuttle about polyester threads "cutting" cotton fabric but I have not had this issue. My mother used Coats and Clarks and that is all I have used for 35+ years of sewing and quilting. Machines can be fussy about what thread you use. You didn't say what type of problem you are having with the thread from Walmart. I agree that it could be old or have been exposed to the moisture if breakage is the problem. You can try other brands of thread and see what works best for you and your machine.

Now don't take me wrong but, I think everyone who is serious about quilting should learn all they can about fabrics and threads and how they are made. This info is invaluable. It will make your life as a quilter (seamstress or embroiderer) much happier and the quality of your work will show it. It is kinda like learning to use all of the feet that come with your sewing machine. Once you understand them, you will know without even thinking which to use and with what. In the mean time, take this good advice that Z gave you, learn your threads.