I run the fiber from my router to my system (45 feet), then a switch, then Network Acoustic’s ENO (earlier model of Muon).
You can use both, it is not an either/or proposition.
The fiber is much, less expensive as posted by @jerryg123 and @oddiofyl. As another example, here are two converters for $42, and a 5V linear power supply for $86, and SC/SC dual fiber cable for $16/10M (dirt cheap). A 10M fiber set-up with LPS for $144.