Here is the list of what Pro includes:
Here is a detailed list of software bundled with Pro:
With the above in mind... A few points.
Pro does not contain extra Hardware Drivers. Everything needed to get the best drivers and hardware performance in Pro is included in Core and Lite.
Please use the forum for seeking help with drivers. You can also rely on the ZorinGroup Developers for Pro Installation Support.
To the question of Is It Worth It?
I would say yes.
I do not say this because of what Pro offers or because of the extra layouts. I say it is worth it because it effectively gives you a viable replacement for Windows. keeping the project alive and funded ensures a stable future for Zorin OS.
Choosing Zorin OS Pro is not so much about buying something as it is supporting something.