distro

Is there a pitfall of using multiple package managers? Could I use Redhat's yum with Debian's aptitude at the same time? I came across this article and this infographic - I was inclined to choose Debian, but a quick VM install showed that the Kernel is not upgraded to 3.2 in the stable repo yet. So I am planning to move to Archlinux, but the infographic rates it low on package availablity and I was wondering if I could install .deb or .rpm files from the Fedora or Ubuntu repositories. The short answer is, yes you can , but you really shouldn't . Below is a list of things (in no particular