It's interesting, while their main powers are both magnetism, Polaris has doen things like bending light, and emitting Red sun radiation, while Magneto has doen things like creating EMPs and affecting nervous systems. Polaris seems more in tune with the radiation side of the electromagnetic spectrum (visible light and all that), while Magneto is solidly an ELECTROmagnetic being. Personally, I think current Magneto takes it,b ut that's only because I don't know a whole lot about Polaris.