For me it depends entirely on the design of the top. I mostly don't do old fashioned designs so I prefer a flatter look. I don't pre-wash fabrics though so for those quilts that I want flatter I use Quilter's Dream poly batting.
So how do antique quilts get that crinkly look??? The fabrics were all pre-washed since they were either scraps from making clothing or the good parts left from worn clothing and quilts were very rarely washed.