Now, to each her own, but I personally wouldn't use serger thread. It's not as strong. My time is more valuable then the fabric, thread, batting, etc. I can't afford to spend my time and energy working with materials that might not hold up. Other quilters might find that something else works for them, and make different choices. I like Aurifil cotton mako, 50 wt for piecing, 12-40 wt for quilting, although anything goes. I also like Masterpiece by Superior for piecing, and their Perfect Quilter or King Tut for quilting.