OK; if you haven't used yum you clearly haven't used a Redhat/Fedora type system in quite a few years. I've used, and continue to use, both and really there is very little substantial difference between RPM and deb formats, between the RPM and dpkg tools, and between the yum and apt repository/dependency handlers. There are little advantages and disadvantages to each, but nothing dramatic.

If you've got specific questions or concerns, what are they? I'm pretty sure those of us with more recent experience of RPM systems will be able to answer them.