Magnet type is a vital feature to look out for. These facilitate electromagnetic circuitry that affects the flow of electrical energy through the wire coil in the speaker to reproduce the sound waves.
Although all types have their unique benefits, Neodymium magnets pack more magnetic energy per ounce than conventional Ferrite, Samarium Cobalt or Aluminium magnets, producing higher sensitivity and ample sound output using less power. Neodymium magnets are a fraction of the weight of the ferrite magnet that might be used but its sound definition and bass performance is 8 times better. Thicker the magnet, punchier the bass, to put it simply.
Neodymium might be lighter and better but will be paired with higher impedance to produce higher quality sound..