I have only been quilting for a few years so not an expert on this but
the poly batting I used "bleed" and did not hold up well. I started using
warm & natural and love it. I always wash mine as I want everything I put in my quilt washed. Never had a bit of trouble with it. I do not hand quilt but the people I have had do my quilts loved it and the long arm quilter liked it too.