I don't particularly like it because they monetize features they did not develop. They charge extra for some UI customizations that are available for free in many other distros because they are part of GNOME/Xfce.
Other than their available visual customizations (giving you a Windows-like interface out of the box for example) it is simply the last Ubuntu LTS release. If you purchase the Pro version you need to re-purchase it for every version upgrade (so every two years).
I would say just go with Ubuntu if you're considering Zorin.
I don't have a problem with charging for free software. My problem is that what they are charging for is a configuration that is provided by other developers' work.