The biggest difference is #2. Look at the high scorers on TopCoder. They have a ridiculous number of points, but are they really the best programmers? No, th

The biggest difference is #2. Look at the high scorers on TopCoder. They have a ridiculous number of points, but are they really the best programmers? No, they are decent programmers who spend a great deal of time on the site. As a very good programmer who does not want to waste away their life on the site, you have no hope of coming close to them. Stack Overflow reputation is similar. With Code Anthem you are scored in a language in between 20 minutes to an hour, depending on your own speed. After that you are ranked compared to all other people and there's no way to trade time for points.