I have always used Mettler silk-finish for piecing but recently decided to try Aurefil and am a convert! It was amazing how much longer each bobbin lasted before I had to change it so I saved time and could keep sewing. I am never going back.
I do use CT thread for my long arm and it loves it. I did try something else for one quilt and had a lot of trouble. I know CT is linty so I just clean out the bobbin area more often. It's worth to have thread that doesn't keep breaking.