Agree with Nemo, personally, I use voxels to create just that volume, or mass, something that I can sculpt on. It does however provide alot of tools for detailing a volume as well. After creating the basic mass, I switch to surface mode because it is fast. And when I am in surface mode if I have sculpted something that begins to stretch the skin of my volume all I have to do is hit enter, and the surface re-volumizes for even distribution while still leaving me in surface mode. .