If you have HB modelling bundle, retopo is a breeze and a joy, but even without it Cinema is capable, if not stellar in this area, particularly in latest versions, where we have the relax mode for the brush and magnet tools and we can project poly pen to underlying meshes live as we use it.
I can't answer if 3D coat is better for this, never having used it, but the fact that I do retopo pretty much every day, and have never felt the need to leave Cinema to do it must say something...
CBR