I tend to get the Gutermann. It depends what I'm sewing as to which one I'll use.

If you use cotton thread, then the thread is more likely to break if something gets stretched or pulled too hard. Then you can just mend the seam.
If you use synthetic thread, the fabric is more likely to tear away from it or pull at the ends.

I buy thread on a case by case basis, and I accept a lot of handme downs from MiL, so my collection is fairly substantial.