It is now in vogue to do articles like Can You Tell a Sunni From a Shiite?.
It is interesting that no one would write articles on "Can you tell the commonalities between Sunni, Shiites, Christians, Jews, Buddhist...?"
The article is an indication of the author's goal. If you are looking for conflict you need to find and magnify the differences, if you are looking for peace and harmony you would be interested in the commonalities. Win/Win can be achieved only through understanding and magnifying the common grounds. Any thing else ultimately would lead to lose/lose for all of us.