I don’t think that is true.
There is no point in using EPEL on Fedora, because EPEL makes Fedora packages available to CentOS/RHEL. RPM Fusion is not enabled by default (anywhere, I think), but there is certainly no reason it couldn’t be enabled on a Fedora Server system.
Server vs. Workstation:
- There are some differences in the default partitioning, regarding default filesystem (XFS on Server vs. EXT4 on Workstation) and the creation of a home partition, swap, etc
- Additionally, the default firewall rules differ slightly, Server allows access to SSH, DHCPv6 and Cockpit, while Workstation allows SSH, DHCPv6, samba, and ports above 1024.
- Default package selection, Server installs the
server-product-environment group, while Workstation installs
workstation-product-environment, the main difference being graphical software (workstation) and the Cockpit control panel (Server), as well as some Server-related default services.
- Server boots into multi-user.target, while Workstation boots into (I think) graphical.target. not 100% sure of that.
If you want, you should be able to figure out the full set of differences from the Kickstart files that create the releases. Practically speaking, I would follow @twohot’s suggestion and build on top of the minimal install. It’s what I usually do for my servers as well.