Why I prefer to use Elometer for player ratings?

Here's The United States Chess Federation rating estimator:

http://www.uschess.org/index.php/Players-Ratings/Do-NOT-edit-CLOSE-immediately.html

Vs. Elometer:

http://www.elometer.net/

When starting out, Elometer can be used as a leveling system for unrated players that have no tournament or paid organization ratings.