My network map:
I am unsure about which Ubuntu OS would suit these tasks better.
For the Primary Domain controller and backup domain controller, I am planning to have Samba file and print server on a normal Ubuntu PC.
And for my Raspberry Pi cluster web server load balancer, the OS will be normal Ubuntu. (By the way, RPi stands for Raspberry Pi).
I have read in multiple tutorials that Samba file and printer share will be better in Ubuntu Server OS, but I don't really get it.
What is the difference between normal Ubuntu and Ubuntu Server, and which OS would be better on these computers in the picture?