Which is the strongest type of magnet?

Neodymium (more precisely Neodymium-Iron-Boron) magnets are the strongest permanent magnets in the world.Neodymium magnets are a member of the Rare Earth magnet family and are
the most powerful permanent magnets in the world. They are also
referred to as NdFeB magnets, or NIB, because they are composed mainly
of Neodymium (Nd), Iron (Fe) and Boron (B). They are a relatively new
invention and have only recently become affordable for everyday use.