I have been using apt-get for some years on Ubuntu now, and tried aptitude a few times. I have read in some blogs that once you have used one of the tools on your system, you should stick to it and not use the other because they don't work the same way and it would lead to problems.
Now, after reading http://serverfault.com/questions/21105/whats-the-difference-between-apt-get-and-aptitude, I can't see why.
So is it true ? And in that case, with systems like Ubuntu including an automatic update probably using apt-get under the hood, is it even recommended to use aptitude ?