I am worried about the not extremely way... There are two points I consider: 1) If the magnetic is stronger then the needle should be heavier. 2) if the magnetic is made by electricity, then the temperature on the needle will be higher, so making the magnetic weak. So the fastest returning may...
The compass have the ability to turn around to the position of south or north if not in the position, for the compass with stronger magnetic, will it return more quickly than the weak magnetic one?