Oh wow! This is fascinating! I want to try the two: Connecting threads (partial spool possibly 100 yards)and Aurifil and have been wondering about them. Specifically, The machines I use do not have horizontal spool pins, will both of these work that way? Are they stack wound? Also, I've read that Aurifil is two ply and makes a difference in 1/4" seams when piecing. And DHM says she only uses the heavier ones for quilting. I'm a fan of Wendy Shepherd who uses Aurifil and I love the look of her quilting. I just did my first attempt at anything but sitd with some designs on the border and blocks and didn't really like the look of it....just used C&C which I figured wouldn't look that good.
So I will look forward to your testing and all we'll learn from it! I hope you'll do both piecing and quilting so we can see what they all look like. Quite a project you've taken on and I think it's wonderful!! It will make a wonderful tutorial and reference piece.