AAD is quality, whereas ATL is merely quantity.
While I get CNN international and Fox News down here and while I can certainly peruse the internet for news, the reality is that I'm not constantly saturated by the American news media. Actually, for the past 8 or 9 years, the Atlas forum has been my main source of analysis for US politics.
The fact is that for the past 8 months or so if I had just read this forum I would be constantly baffled by this election, results and campaign events would come as a complete surprise and if anyone asked for my opinion I would have certainly given them wrong information. I mean, I would have thought that trump's opponents did better in debates than they actually did, I would have thought that the McCain comments would sink his campaign, etc, etc.
Reading AAD gave a much more accurate picture of how the election was developing and provided a better understanding of the electorate and the Trump phenomenon. For a political junkie this seems to be a pretty important aspect.
Plus it's more fun, this place seems to be completely devoid of humor most of the time.