OnTheFly7

I tie all sorts of junk but I am a warmwater fisherman at heart and really like my Bass, Pike and Muskie tying. For all Pike/Muskie flies I have been using UTC GSP, simply because UNI GSP seems impossible to find, unless I'm that dumb. For spinning hair, I still like thread as I feel GSP cuts into and through the hair more than it spins it.

I have used UNI Products for almost 20 years. I am contemplating a switch over to UTC because I like how it lays much flatter, however UTC seems to be more difficult to obtain, especially in sizes other than 70 and 140. Which thread do you folks prefer between these two?