There aren't that many. And for a situation like yours there's no practical difference (I don't think). I don't hate apt-get, it's a real program. As opposed to that children's toy known as synaptic
For most usage apt-get and aptitude are interchangeable. This is especially true if you're running a stable system. However, even on a stable system, when updates get complicated (as in a dist upgrade) you're still better off using aptitude. Dependency resolution and handling is better in aptitude.
For the same reason I'd argue that if you're running mixed systems you're better off running aptitude, although you still need to know what you're doing and have other pieces setup correctly. But for a mixed system aptitude just makes things easier at times. And at other times it really doesn't matter which tool you use.
Whichever one you use I think you should at least be familiar with the basics of the others.
But you can manage a system successfully with either one (if you know what you're doing). My real problem comes with those people (see sidux developers) that run around yelling aptitude is broken don't use it or you'll eventually break your system just because you use aptitude. To that I say - BS.