Apart from their political orientations, what’s the essential difference between these two?

Beck has a blackboard, and seems to cry alot. Greenwald? No blackboard that I know of. It remains to be seen if he cries much in the weeks ahead.

As to any essential difference, maybe Greenwald isn’t merely promoting himself. And there are some pictures that don’t seem to be made up.
Here’s The $2 Billion Facility Where The NSA Will Store And Analyze Your Communications
Michael Kelley and Brian Jones | Jun. 7, 2013, 12:55 PM