I use YLI glazed cotton - because it is glazed and doesn't knot up when i'm hand quilting. I have used the Gutterman glazed cotton thread and it's ok, but YLI is cheaper.
I'm currently using King Tut on a quilt and can't wait to finish. I don't like it - but it's not a glazed cotton and i feel like i spend my time fighting the thread knotting up. Yes, I take my time to run my thread thru thread conditioner or beeswax to help w/ the knotting, but that takes time...I want to quilt!! LOL!!!
Cutting shorter threads does seem to help. Next time I finish a quilt for someone, I'll just tell them I'll supply the thread.