Drywall Anchors

This is more for my own reference but the drywall anchors that you screw in are better than those steel ones that expand. We have an old house and random stud placement. I just hung a mirror in our bathroom and needed to use some drywall anchors. Those white screw in ones in the picture on the left work great, the ones on the right, steel ones, not as well. They were loose. Maybe the guy at the hardware store had my situation wrong but I’m kind of thinking that those steel ones are more for cement or plywood… Not drywall.