Is One Pole, North or South, Stronger Than the Other?
Neither. A magnet’s north and south poles are equally strong. Every field line that leaves the north pole returns to the south pole, so the field is the same strength at both faces. Either face holds the same weight on steel.
When One Side Seems Stronger
If one face of a magnet seems to hold better, something other than polarity is the cause:
Steel Cup or Backing
Pot Magnets sit in a steel cup that redirects the field to the open face, so that face is much stronger and the back is weak.
Coating or Adhesive
Adhesive foam, plastic or a thick coating on one face adds an air gap and lowers pull on that side.
Countersink or Shape
A countersunk hole removes magnet material near one face and changes how the field spreads.
Does Polarity Matter for My Project?
On steel, no: both poles stick equally. Between two magnets, yes: north attracts south and like poles repel. If you’re building a closure from two magnets, mark the poles first. See how to identify the poles of a magnet.