I use muslin in any pattern that calls for white or natural, and all my quilts (many, many) are backed in muslin. Of course, a good quality muslin is a must. I have even made drapes for a bedroom out of natural muslin. If you drive thru any Amish country look at the windows---white muslin curtains hang there.
I do not like what I call "painted" white fabric.....that paint will wash out and then one has just "plain" white fabric anyway. And I don't like the "dust" it creates while one is working on it......looks like white snow........So muslin is my choice of white/natural everytime....