Subsurf (I'm used to calling it subdivide.) can be useful for the overall shape, but my thought is that when you cut it down into layers for tailoring that it will make it much more complected than necessary to get a good shape. (I'm not exactly sure how to express this, but if you can understand cutting down a rounded object to make a flat layer is difficult, somewhat like trying to get the shape of the earth onto a flat surface, it doesn't fit perfectly.)