No need for fiber for 1.6 gigabit, Cat5e can do 10GbE over short distances, 2.5GbE over longer distances.
The other advantage of fibre is subtlety if you can't (or don't want to) run it through walls. 0.9mm diameter and light enough to attach it with occasional dots of glue instead of needing cable clips.
alt Hacker News
The other advantage of fibre is subtlety if you can't (or don't want to) run it through walls. 0.9mm diameter and light enough to attach it with occasional dots of glue instead of needing cable clips.