Question

Why are artificial magnets preferred from natural magnets

Answer 1

Artificial magnets can be made as per our requirement, but natural magnets only have a limited number of uses as they cannot be present according to our requirements. 
Also, artificial magnets like electromagnets have huge advantages.
Electromagnets are preferred over natural magnets because
1. Their strength can be increased or decreased as per our requirement.
2. They can be switched on and off when required.
3. They can provide the required field due to small size.  

Answer 2

artificial magnets preferred from natural magnets because artificial magnets or man made magnets are more clear than the natural magnets.

it is in my view. I don't know about it much more.