You can get 10gb SFP+ fibre modules for peanuts on Aliexpress.com
Standard modules are unidirectional so there are 2 fibers for there and back.
There are also BiDi or BiDirectional modules which only need one fibre, the BiDi SFPs and SFP+s are bought as matched pairs as they have their transmit and receive light sources using different frequencies that are swapped at the other end of the link.
The benefits of fibre are that it’s not an electrical conductor, you can fit several of them in the same physical space as a cable run and they are immune to electrical noise/cross talk.
If you have kit with SFP slots already then fibre is something to consider.