Hi!, again. I was wondering if there is a difference between extruding whole faces via extruding edges and just extruding ...

Hi!, again. I was wondering if there is a difference between extruding whole faces via extruding edges and just extruding vertices one by one, I thought I would have a little more control at the time of positioning the vertices with the later but after I finally manged to fill the remaining mesh with quads the ending mesh was not really smooth even with the subsurf modifier maybe I did something wrong elsewhere but that´s the only thing I could think about I did different.