As I demonstrate here, aptitude is preferable to apt-get if you install and then uninstall a lot of applications.

There are a lot of threads about apt-get v. aptitude, and almost all of them come to that same conclusion:
http://www.ubuntuforums.org/showthread.php?t=162114
http://www.ubuntuforums.org/showthread.php?t=131922
http://www.ubuntuforums.org/showthread.php?t=117394
http://www.ubuntuforums.org/showthread.php?t=91535
http://www.ubuntuforums.org/showthread.php?t=66995
http://www.ubuntuforums.org/showthread.php?t=37736

Now, my first question: is there a downside to aptitude (as opposed to apt-get)? If so, what is it?

Second question: if there is no downside, why does almost every Ubuntu guide out there ask users to apt-get stuff instead of aptitude installing/removing stuff?