Drywall screw is better for hanging drywall mostly because of the" bugle head"
, a modified flathead that flares out shallower and flater to give more
gripping surface. Use a fine thread sharp point for most steel studs, a drill
point screw for thicker ones. The fine thread cuts a self matching thread in
the stud. If you are talking about fastening the studs to other studs the fine
thread is finer than most sheet metal screws, more grip, the sharp point will
usually cut as fast or faster than most self tapping sht metl screws. the
buglehead is thinner than sheet metal screw head, less bulge. And you don't
have to have two kinds of screws to get mixed together in your pouch.