If it helps in your decision; 009jim:
You could go ahead a run Zorin for the next 30 days and while doing so check out other distributions.
The truth is there are 3 main Linux Distributions that are supported.
Slackware, Debian and Red Hat Enterprise Linux.
Most other distributions are derived from one of the 3.
Slackware has it's own tools but unlike RPM and Debian systems does not do automatic dependency resolution.
Dependency is a program or library that another program needs to run.
There are some distro's that are unique things unto themselves like Gentoo and Arch Linux.
Debian is the foundation of more distro's that Red Hat.
Maybe consider Debian or Linux Mint--