I find the sheer variations of threads so daunting! I've been using Aurifil and Connecting Threads but wanted to branch out so I bought several spools of a lot of different ones. Well, I'm still a bit confused haha.
I like So Fine or Bottom Line (not sure which) which is currently in my Bernina. I've been piecing and quilting with it. Low lint and seems to last forever.
If you check this board there have been several very good topics on threads. There are many good ones out there.