There are no rules, nor best practices that would apply to every quilter or every quilt. I often read the descriptions of the techniques used in quilts in magazines and quilt show catalogs and there are award winning quilts (Paducah award winning, not local guild award winning) that have both machine and hand quilting on them, depending on the area quilted, or the techniqe needed.
Which ever way is the BEST way for YOU and the QUILT is the RIGHT way.