DIFFERENCE BETWEEN ALL THE ALIGNMENT METHODS

HELLO FRIENDS....

I NEED TO KNOW THE DIFFERENCE BETWEEN THE THREE ALIGNMENT METHODS{ELEMENT, QUICK ALIGNMENT, AND BESTFIT ALIGNMENT}. WHAT THE ARE THE CASES WE CAN USE THESE THREE METHODS. ADVANTAGES AND DISADVANTAGES OF THESE THREE METHODS. 

PLEASE GIVE ME SOME IDEA ABOUT THESE.

THANKS AND REGARDS,

PATRICK.X