AP US Government and Politics v. AP Comparitive Government and Politics

What is the difference between the two? Which is more helpul, easier, more popular?

US covers the American government only, while Comparative covers several countries’ different government systems. US is by far the more popular one (136 thousand vs. 12 thousand takers in 2015), and most high schools only offer US as a single semester course. High schools that offer Comparative usually teach it in the spring, after doing US in the fall, so you can think of Comparative as the more advanced Government class.