Walt
I will only use Mundial scissors. My grandfather had an upholstery business for many years and he always said that the Mundial scissors can be sharpened over and over without problems, unlike many of the other brands out there. Don't know if this is true or not...but I have had my Mundial scissors for almost 3 yrs and use them daily and they still don't need sharpened.
Sorry, don't know about the difference as to Quilters vs. Dressmakers.
Hope this helps a little