- Equipment with 10Gb ethernet ports is much more expensive than similar fiber equipment, and it runs hot at the ports - 10GBASE-T RJ45 runs at 2.0W – 5.0W per port, often enough to burn your finger. Especially if something's going to be inside your walls, generating less heat is a plus

- Fiber's somewhat easier to run since it's lighter; it's easier to break but the bend radius is much more forgiving than you might assume. I have yet to damage a fiber cable myself.

- More electronic isolation between equipment is always a benefit, which fiber naturally gives

The tradeoffs lead me to prefer running fiber for 10G which then branches out to 2.5G ethernet for most equipment in the house, but if I didn't have these Tyan boards prompting me to try out 10G equipment then I would probably stick to 2.5G ethernet for everything for simplicity. If you're aiming for 10G then I don't think ethernet would make sense in most situations for both upfront cost and heat generation/power usage.